I assume you are referring to Sandalak withholding the killing blow. Although I personally agree that 'cease-fires' between two realms are too 'diplomatic' for WI, folks have already declared those fine and dandy. Is it any different to declare a cease-fire because you want to gang up on one realm versus declaring one because you don't want one realm to join your enemy? Both seem valid tactics if we are ignoring 'diplomatic relations'. The second one just seems more 'playing with friends' considering Ikalak's rough start.
I thought there was no specific 'right' way to play BM, anyhow.