Was probably hard to see him flailing under that sudden swarm of creatures, but you could definitely hear him crying, terrified yelps echoing in the hall. They slowed down as the noise died down as well, scattering after a few moments. They left a fizzling puff of darkness and dissipating data fragments wafting in the air where he was, shredded bits of his outfit all around, as well as a few small puddles of blood.
Nothing stayed nearby aside from one odd-looking white Rabid Dog-like Heartless that had appeared after the others had their way. If he had a Nobody after that, it definitely wasn't in this room.