If there was an option while in-game to switch agents with one of the other 4 agents on your team, would you?

I hit a Phoenix for 171 and apparently he was still alive? I thought the max hp was 150, so is there something I'm not getting?

I just had someone in my Immortal game win trade (playing cypher) and would purposefully not look at cam and let the enemy Reyna walk up and flank us all and not place trips. Looked at his history and has 3 previous games with the enemy Rey...