Ever since the update, if you switch teams while you are alive, it kills you. This can activate the Undead's Suicide Bomber and if maxed, can kill half of the team in range.
so in other words, "switching teams" in mid game can act as a trigger to blow ur ass up and anyone next to you, such as team mates?
that could kinda be abused if u want to kamikazee ur ass to get someone up close before they run away :P