"A beam?"
"Yeah, you know, the same beams you see in movies like laser beams? However, the beam here is much bigger like some sort of laser beam fired by aliens in the movies from their spaceships. It was so sudden so we didn't even get to react to it as it only happened in split second and it only happened once. That is also the reason the soldiers around are deployed and are investigating the area for any signs of where the beam came from," Dolly explained.
I tried recalling many weapons or monsters capable of unleashing a beam and the only one I can think of is the Draconic Metal which can turn the surrounding air into a laser beam that it can shoot out from its eyes and mouth depending on the situation. But still, its attacks aren't capable of wiping out a huge carcass of the giant turtle in a snap. No, it's impossible already, to begin with, given the size of the Draconic Metal and the carcass alone.