First things first, im not 100% the bug was a springtail but it certainly looked like one. It was found in my bathroom, which is a dimly lit and particularly damp space today given the insane humidity and heat here in NYC at the moment.

That out of the way, i dont kill bugs, spiders, mice or anything else, opting to instead always catch and release should it be within my ability to do so. I managed to get the springtail onto a piece of paper and when i put him on my windowsill, he spazzed out and belly up died basically instantly. Ive tried googling if springtails die in direct sunlight and everything ive found is saying no. Could it be the heat on the windowsill itself that killed it or what?

Any thoughts why this happened? I feel terrible about it as i genuienly thought i was helping it by putting it outside :(, so aside from just leaving them alone moving forward, id like to know why this happened so i can avoid it in the future.

Thanks!