To my understanding the 74 was LANDING! Regardless of whether or not he COULD stop, he wasn't expecting to have a short field landing. Nor is he expecting crossing traffic. Now that's not to say that he shouldn't be looking out for it. This situation went exactly as it "should" have as far as I'm concerned. The 74 was performing a rollout as specified for its performance. The United pilots had most CERTAINLY already achieved their V1 speed by the time they saw the 74, and had no other choice but to attempt to clear it. If the pilots spotted the plane WAY before hand, but AFTER V1, there is ABSOLUTELY nothing they can do, no need to try to call the tower, obviously they are on diff freqs, no need to make a radio call, the 74 pilots wouldn't have heard them.
AVIATE FIRST
NAVIGATE
THEN
Communicate.
The reason that the 74 pilots seemed to be unaware is also because they were likely on a different frequency. I assume that's why they don't have any chatter on this. But I would assume that the 74 pilots would've seen that 73 coming at them and either accelerated to get out of their way, or just remained idle. Depending on when they noticed the jet going from a holding position to a rolling position which is VERY difficult to see esp when ur trying to rollout a heavy.
So I say well played by both groups of Pilots. (Well... as well as it could have been played)
The controllers likely got their timing off, or someone was moving slower or faster than they expected.
Also keep in mind that without that white circle that 74 is still pretty hard to see, and this doesn't have ANY of the very likely other traffic cluttering the taxiways. Seeing a plane out of the corner of your eye a mile away at KORD is like seeing windsheild wipers on a car... They're there, you know they're there, why should you worry.
No Im not saying get complacent... just, well you get the idea.
~DAVE