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I would say no because there's no indication whatsoever that your character would know they needed to protect the ally in that specific moment. Line of Effect and Line of Sight both impede its use.
I'm also going with no.
My example that I thought of is a fighter with an attack of opportunity against an invisible creature that has used stealth to hide successfully from the fighter. The fighter is unaware of the enemy's position and can't make an attack of opportunity, that makes sense to me.
In general, I think if you're not aware of the actions an enemy is taking, you can't react to it.
I'm not sure if that explicitly encapsulated in the rules though.
I would say yes you would need to be aware (as a reaction is a choice and if you aren't aware then you cannot make that choice). I wouldn't say that you needed line of effect, but you would have to know that something had happened to trigger your reaction.
RAW with glimpse of redemption you don't need to know, see or even hear the event. But I wager that is a pretty loose reading for RAI.
Another example would be feather fall, say you are fighting in a house, the enemy teleports your ally suddenly with a unique creature ability you didn't know of (they are now 60ft up in the air above the house and are falling)
RAW you can cast featherfall as a reaction on the character that you have no idea is falling and can have no idea is falling. But I sincerely doubt this is how the designers envisioned the usage of the spell, and it seems more than a little meta.
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The rules on reactions include no requirement that the (re)actor have awareness. Further, there are reaction triggers that do require awareness, like kobold Cringe:
Trigger A creature you are aware of critically succeeds on a Strike against you and would deal damage to you.
But (!) if your character doesn't have awareness, then it will often be the case that the GM will make it so neither do you as a player. You can't invoke a reaction for your character if you yourself don't know about the opportunity to do so.
The rules on reactions include no requirement that the (re)actor have awareness. Further, there are reaction triggers that do require awareness, like kobold Cringe:
Trigger A creature you are aware of critically succeeds on a Strike against you and would deal damage to you.
That's different. Even if you were not aware of the creature you would be aware of the trigger (as you are the one taking the blow). So the distinction is important.
Reactions need awareness, otherwise you have some crazy situations like a Wizard successfully using Conceal Spell triggering Counterspell...
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Reactions need awareness, otherwise you have some crazy situations like a Wizard successfully using Conceal Spell triggering Counterspell...
This is precisely a case where you wouldn't have the information as a player to invoke a reaction. The GM may allow you to invoke it on a hunch if see the manifestations from the beginning, but you instead may only be informed that your character was just struck by lightning and took damage.
Normally no, but with the champion's reaction, you only need to know that your ally was damaged. You can prevent it, but only if the attacker is also within 15 feet. You don't have to know that part, but the magic will only work if the attacker is within range.
Trigger: An enemy damages your ally, and both are within 15 feet of you.
There is nothing here that prevents you to use a reaction if you hear that sword connecting to your ally, not even that. The whole concept of the damage prevention from the Champion's reaction is already divine. Some sort of field surrounding the champion in which he's aware that someone gets hurt.
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Normally no, but with the champion's reaction, you only need to know that your ally was damaged. You can prevent it, but only if the attacker is also within 15 feet. You don't have to know that part, but the magic will only work if the attacker is within range.
Trigger: An enemy damages your ally, and both are within 15 feet of you.
There is nothing here that prevents you to use a reaction if you hear that sword connecting to your ally, not even that. The whole concept of the damage prevention from the Champion's reaction is already divine. Some sort of field surrounding the champion in which he's aware that someone gets hurt.
https://2e.aonprd.com/Rules.aspx?ID=359
This is the line of effect rule. This is a general rule that the Reaction falls under. It's an effect being blocked by a solid object. The situation described by OP clearly states that there is no line of sight or effect.
So a champion wouldn't know neither would be able to use their ability even he somehow did. Even though we engage with the game as a round-by-round and action-by-action in discrete divides, the battle itself in-world, is happening in a fluid sequence, which makes it hard for someone to tell what's exactly is happening behind an object that blocks sight completely. You're free to allow the trigger as much as you want, but it is against the rules of Line of Effect and its restrictions, if there was a small opening or slit that allowed Line of Effect, then I would maybe consider allowing (probably gating it behind a successful Perception check).