So my year and half old panther was just drinking and just as he finished doing so he seemed to suck in his stomach until it was all the way inverted. He was opening his mouth very wide and gaping wildy. He kind of ran around the cage in a panick mode in made a final sprint for the top, flailed and gaped some more and then calmed down. I thought he was choking for sure, easily the scariest moment I have had with him. I've filled out a enclosure form and everything checks out. Anyone know what this might be?