It's dripping down from the hatch. It's point of origin is above the hatch. The presence of red substance on items on the deck where the person filming is doesn't mean anything, since there were also paintballs with red paint in them being fired as well. Most likely the red on the things near the videographer is paint from paintballs. Which would account for the initial confusion about what is dripping down from the hatch.

As I've said already a few times, what other reason would the Israelis have for using paintballs with blood colored paint in them in a situation like this one? When before has any kind of military commando unit ever used paintballs as a part of their ordinance? Why would they use them in this context? The only reason is to obscure something they don't want seen and to create confusion.