He walls.
Status screenshot for SteamID (also in title)demo 1 (right-click, save as)
demo 2 (right-click, save as)
Demo notes:
Demo 1
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1:10 - comes around corner with a 'nade primed ready to throw, rather than coming around with his gun out
2:05 - maybe pre-aim (twice -- especially on the second guy)
Demo 2
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0:27 - pre-fire, no question at all. Nobody's reflexes are fast enough to shoot at the guy's elbow the moment it comes around the corner.
2:20 - no hacking, here, but it's proof that he doesn't know the map well enough to know where to prefire
2:26 - he pre-aims *hard*
2:31 - notice how he looks at the guy up top through the wall?
2:34 - hm... just a funny place to aim as he walks up, or does he see the guy there?
2:37 - why does he turn and stare for a second at the balcony?
2:45 - oh, look, he's sure good at knowing when he should look back!