Melees in the SCA
"Last man standing" types of melees are sometimes called "Roman melees" or "bear pits".
In this form of combat it is normal that a person may not kill from behind. However they may inform a person that they have been engaged from behind and that combatant should turn to meet that challenge. Melees generally do not allow the use of missile weapons, though there are some cases such as village football where this is allowed. Special scenarios are occasionally used, like ransom melees.