This is interesting, feel free to adjust/debate my assumptions:
Nigel shoots with 20 seconds left:
30% it goes in, 50% chance we stop them - 15% chance of victory
Call a timeout, we try to shoot with 5-10 seconds left? Because we're trying to score in a small window, I'd lower the chances of scoring. Let's say 40% chance of a tie, which leaves us with two scenarios:
40% tie, 70% chance we stop them, which leads to overtime, where it's 50% chance of victory. 14% chance of victory
Shane shooting was clearly the worst option and I won't bother calculating. But even in this scenario,