Killmonger’s passive on Extreme prejudice is supposed to boost your friendly matches on the enemy’s strongest color, this does not specify a target so it should work on any characters on the enemy team. This is not the behavior I’m seeing when trying to use it.
The extra match damage only seems to work against whichever character actually has the strongest color, it is not working If I target anyone but that character.
This is happening on Steam. Someone else tested this on the mobile version and was not able to reproduce the bug.