Being "revived" by a medic or team mate in an airsoft game takes different forms as defined by airsoft organisers. In milsim events, they try to mimic real world actions and in this video DesertFox Airsoft explains how one can be revived by a medic or team member when hit during a Milsim West event... "How to properly be revived after your first and second hit at a Milsim West airsoft event.  

First Hit: 'Buddy Aid' - Tourniquet may be applied by anyone except yourself