The snowball fight spawn protection has been suggested before in this thread:
Minerware has a lot of interesting and fun minigames, but there is 1 thing that bothers me. The snowball fight is a pretty short and fun minigame, but I don't have the chance to defend myself since I get automatically killed. For reference, here...
www.cubecraft.net
I fully support this since you can die quickly and unfairly in snowball fight.
However I definitely don't feel the same about last knight standing. I never get more than a single unfair hit and it's much less luck based than snowball fight