What is the difference between down and execution?
Down= when you kill them, but they can still be revived ( they crawl)
Execution: When you finish them off when they are crawling and down ( they cant fight back, they can only be revived, good idea to bait this if an enemy is near sometimes). Execution happens when you shoot the downed enemy, with a gun or something
Special execution: this is when you go and press triangle on an downed enemy, which does that cinematic kill ( gun to the head, beat to death, melee to death etc...)