Guy was dancing in joy at the scene, moments after Kirk got hit. "Dancing Israeli" is a reference to a group of Israelis who were caught photographing and then celebrating the 9/11 attacks (suspected mossad, quickly deported and covered up; later in Israel, they revealed themselves).
Normal reaction in this scenario is to duck (like everybody else) in the face of a threat such as this. To do the opposite, in the heat of the moment, with so much confidence only suggests previous knowledge of the event.
Mainstream media about to crucify themselves with a fairytale which i suspect nobody is gonna believe. Unlike 9/11 which took many years for conspiracies to develop, here, Israel is being implicated from Day 1 with mounting evidence.