I think it's a thing in COL arena when their penalty ends. Like a sign that they're back 5v5 or something like that. I remember that from the DAL series in the bubble as well when they brought that effect there too (it was extremely clear then as there were no audience).
He's not. That goal happened because he's not able to skate properly, he happened to be in right on the right time because he wasn't able to skate properly.