Jim looks down into the bottle, aware that this is his last chance to back out of the whole thing. Like James Tiberius Kirk is the type to chicken out of something like this. "Bottoms up," he mutters, and downs the potion.

Hermione had said that it was going to affect him immediately, but it's still a surprise when it starts hitting him before he's even lowered the bottle. "Huh," he says, suddenly feeling like he's run a hundred miles, and he sways a little on his feet.


[Like waking up in a dream you mean? Possibly... I did have a specific memory in mind for him, but there could be a couple different ones in a row without him returning to reality first.]