I was recently roaming around the wz while immune with an immunity orb and ran into the situation that other people's "slam" abilities on their sword still affected me even while immune. Not only did I receive mining fatigue and slowness but I lost hearts as well. I personally think that this should be removed from the game (the ability to get "slammed" while immune, not remove the ability) because it is a very easy way for people/teams roaming the wz to get free kills on people even when they are immune which means easy gear. If you run into a team of 3 or more people its almost impossible to get away from it because as soon as the slam wears off another will slam you again giving you slowness making running very hard unless you are close to an outpost. You also can't /spawn because if you are slammed it actually does put a temporary combat tag on you.