they spotted some kind of optics following troops. hamas teams frequently have cameramen to film hits or remote controlled cameras in general for surveillance. also sniper rifle reflections and camera optics reflections at large distance looks similiar.
edit: few days ago they identified somebody who put camera on external stairs of hospital near roof and followed troops. troops got attacked a few times. they asked for approval to take whoever it is down. approval was given but it was conditioned to use "light munition" to prevent too much damage. from some reason was used heavier munition. currently they investigate why orders weren't followed.
Israel literally bombed a hospital then double tap killed the rescue crew and the journalists covering the original war crime, and it's all on video for anyone to see.
Wtf? You can't do this here. That ought to be obvious, regardless of your views on the underlying topic. We've banned the account.
https://news.ycombinator.com/newsguidelines.html
Someone posting the way you have about war crimes ought not to be advocating them.