oh, its ok, dont feel too bad. accidents happen, and we cant help that. you didnt maliciously kill it, or anything, it just an accident. weve lost a few chikies to stupid accidents over the years. it happens to most people. we had one get stomped by my then 4 yo daughter. about 5 of the older peeps liked to chase her around the yard , she held them all the time and gave them treats, they knew who the treat girl was! well, they were running after her and she turned around and stepped on one. it got mushed. she was really sad.
once i had this teeny runty silkie chick, just days old, i thought it would die, but i tried to feed it some water with a dropper and accidentally drowned it. uuuuugggghhhh....i felt awful. but it was an accident. and actually just a few months ago, we got a hatchery surprise with 2 little silky bantams, they didnt look good, but this time i was not going to make the same mistake, one still died, but one made it, and is doing great ! so dont feel too bad. it happens.