First of all thank you @WolfRam for finally providing at least a partial fix. Was glad to see that change a few minutes ago. Even though two different people teamkilled me in there on purpose anyway á few mins ago I think it should at least reduce the amount of teamkills a lot. One thing you could possibly do is reducing the damage that is made per moment in which you get blocked. Like maybe 20 hp damage each time. This way it should be almost impossible for players to teamkill others on purpose and even the accidental teamkills should decrease.