Wouldn’t be the first time a supervisor is wrong
So let's analyze a bit here:
1. We're at crunch time based on both the score and the game clock
2. We've got a clear DEAD BALL substitution violation.
3. A knows the substitution rules and B has an absolute right to match up substitute here
- which is why 99% of coaches would not substitute on offense here
4. B notices the late sub and a B player leaves his position and heads out to "cover" A
5. But maybe the B player is not the right player to be covering the incoming A substitute?
So, simply because any B player saw the A player we're good??? Really???

I'd be interested to see if the powers to be decide to include this one in this week's video clips.