TOPIC: attackable

During a non-team war, you can attack anyone of your kill value or higher, and
anyone who belongs to the next four lower kill values that are _currently
alive_.  For example, if you are worth 9 kills, and there are players worth 7,
6, 5, 3, and 1 kills in the war, you can attack the 7, 6, 5, and 3 players, but
not any players worth 1.

During a team war, you can attack anybody on the opposing team--you cannot
attack anybody on your team.

During a ball war, you can attack anyone who has the ball or is on the same
team as the ball carrier.  If you or your team has the ball, you can attack
anyone on the opposing teams.