Given the amount of snow melt flowing under that ice topout, I'm surprised he wouldn't have been aware of how tenuous the ice quality would've been for the whole time he was on the route; as that water would've been between rock and ice for a considerable distance below where he had his epic...
To push on in such circumstances was definitely a calculated risk that was badly assessed.
Hard to tell, but it looks like he was trailing a rope from his harness, other than the one thrown to him?