Charm Person vs Spellcasters

[Fearspect]

I'm hoping to get a little clarity on how these things interact with each other. I'll give a mock situation as an example:

I see an enemy guarding a treasure that I have been sent to recover, and cast Charm Person hoping to use that to persuade him to let us pass freely as opposed to having to fight him. He is an appropriate CR spellcaster with skillpoints in spellcraft, but fails his save vs the Charm Person.

1) After failing, does he still get to make a spellcraft check vs what you just cast (or does he somehow forget about the spell happening)?
2) If yes to above, does that allow him to realize that a charm person was cast, and he needs to be suspicious of those around him and his own actions?

How do you properly use this spell in the real (pathfinder) world?

Thanks, sorry, new to all of this and just trying to think actions through on my downtime.

[SlimGauge]

He gets his spellcraft check BEFORE the save against charm person (because he might have a readied action to counter spell for example).

[Dave Justus]

If he fails his save, he will treat you as a trusted friend and ally. So he won't be suspicious. He may well know that you cast a charm person on him, but because he is under the effect of the enchantment, he will feel that it was in his best interest, that what you did was entirely justified and indeed, you are trustworthy and a good friend.

Now, normally, he probably wouldn't let even a friend enter the area he was guarding, that is where you would need to make an opposed charisma check to convince him that letting you through is a good idea.

And, when the spell wears off he will remember, and likely be somewhat angry.

[Fearspect]

It seems exceptionally powerful for a 1st level spell, but I suppose it will all come down to where your GM draws the line on 'convincing it to do something it wouldn't normally do' and just drowning you in opposed CHA checks until you fail.

[Claxon]

The power of the spell is heavily dependent on how the GM runs it.

I for one would make you perform the opposed charisma check to get access to the chest. You're his friend, but this is his job and possibly could cost him his life (dependon what kind of organization he works for). It doesn't seem like something he would let a friend freely access.

[SlimGauge]

If I wouldn't do it myself, I probably wouldn't let my friend do it either. If I'm guarding the MacGuffin and wouldn't sneak a peak, then I wouldn't likely let my friend sneak a peek either, but if I take a peek to satisfy my own curiousity, then there's probably not any harm in letting my trusted friend see it either. If I wouldn't steal the MacGuffin myself though, I probably wouldn't let my friend steal it either.

[Fearspect]

Oh, that's fine, I get that this is not a free pass to do what you want, just was throwing up an example off the top of my head.

My real concern was whether a cunning NPC with spellcraft could negate the spell even if it was successful.

[aegrisomnia]

^ Nah, you charm him, you're good to go.

[Robert A Matthews]

PC casts Charm Person
Enemy: Why you casting a charm on me? You know I've always been your best friend.

[Splendor]

You may be able to convince the NPC that:
1) He is needed elsewhere
2) Its your turn to guard the item
3) The item isn't safe and you're here to move it to a safer location.
4) Or any other situation where you're not just blatantly stealing it.

If you were working at a car lot would you just let your friends steal cars? If the NPC would, then he really shouldn't be trusted guarding the item.