Question about Visualization of the Mind

[MVT]

https://www.d20pfsrd.com/magic/all-spells/v/visualization-of-the-mind/

The wording is confusing to me.
"At any time during the spell’s duration, you can expend the spell’s remaining duration as an immediate action in order to gain a one-time mental enhancement associated with the ability score you chose to visualize, as detailed below. After you do so, the spell ends."

Does that mean I end the previous effect and instead the new effect listed below for 1 minute, or does that mean I have all of it and the new duration is only 1 minute left, instead of the longer duration it was before?

-So I cast the spell and choose INT and get a +5 bonus to INT Skills.
-Then, I do the thing that gives me a +HD bonus(+3 from it being a class skill) to a skill I dont have ranks in, let's say spellcraft.
-I make a spellcraft check.

Do I:
-get a +5 bonus, and then drop that, and get +HD+3?
or
-get a +5 bonus, and then add on to that +HD+3?

[avr]

After you do so, the spell ends. It's still in effect when you make the check.

[mavet]

avr wrote:

After you do so, the spell ends. It's still in effect when you make the check.

See that was my immediate thought too but the problem is:

Is that after you make the immediate action or after the one minute?
Wouldn't I be making the skill check after taking the immediate action? Wouldn't that mean i take the immediate action, the spell ends, and then i get a new auxiliary bonus? It doesnt say after one minute or after you use the new ability. it says "take an immediate action, after you do so the spell ends" and then you get a new ability?
Im still confused by the wording. I thought it was straight forward until a friend pointed out the wording.

[avr]

If you're making a spellcraft check in reaction to someone casting a spell (to identify it) then that immediate action happens at the same time as the spellcraft check. If you make another check next round you just get the one bonus, but the first one? That's got both parts in effect IMO.

[mavet]

avr wrote:

If you're making a spellcraft check in reaction to someone casting a spell (to identify it) then that immediate action happens at the same time as the spellcraft check. If you make another check next round you just get the one bonus, but the first one? That's got both parts in effect IMO.

So i have both the +5 and the +HD if i use the skill the same round but not if i wait a round?

[avr]

That's the way I read it.

[Shinoskay]

I disagree

Ok, I rethought it and actually I agree.