It’s almost impossible don’t hurt your teammates on a game with the hammer. I get ban from 2 games. And I was the MVP more kills and more goals and loose my legendary card!
Some times my teammate betray me and that’s OK. (my point of view). Because was a mistake. Hammer create a radius of damage probably you hit your opponent and your teammate with the same strike.
So please try to implement a fix for that. Maybe quitting the option of ban for doing a betray. Or modify the parameters of the ban.