Player Ally

A Player Ally is a npc or bot that will help covering the player and protecting him, an ally is different from a companion. A ally does not stay or survive any longer then a companion, a companion is someone who helps you through all of it. Allies are very useful for a pitch but don't trust them with your life, most npcs' hate you as much as them because they help you and what helps you must be destroyed. Take a rebel for example, a rebel is a good ally because they protect you and take off anything you brace such as a npc_combine_s, npc_antlion and a npc_zombie. Rebels are perfect for allies because they can die really easy but just as strong as a combine soldier.