while playing blockland online, everyone can find your ipit just takes a little script kiddie logicand whether or not they would actually stalk you and kill you dead depends on who they are, but most likely they will not track you down, too much effort over a little forget here and therewait nevermindaaanyway i've never heard of someone killing someone else over a little internet cussing
I doubt he can track your IP at all let alone find out what it is.