Heh, he's unusually fit for a guy wearing the equivelant of a truck hm? Its realy weird seeing them leap up 4 metre ledges no problem. I had a glitch similar to this before except less scary. It was an average armored enemy, running about as if it were just a normal NPC. He took cover and everything. Weird, weird stuff
Co-op Adventure on Syria is so hilariously glitched. The no-reticule glitch, running PAK-80 brute... twice, I was playing and after the cutscene where Sully, Elena, and Nate are knocked through several floors and into a pool ended, I was stuck underwater and I couldn't get back up, so I drowned. I'm glad my friends finally got that one finished, because there's no way I'm playing Syria on Adventure again.
As long as we're on the topic of Adventure glitches..
There was one time I had just reached the end of Borneo on Crushing and during the final cutscene, while Sully and Drake are talking about the artifact and the etching of Janus, an enemy starts randomly shooting at Chloe off-screen. During Drake's and Sully's dialgoue, you could hear Chloe saying things like "Help!" while blood was splattering on Drake and Sully.
Needless to say, I lol'd.