"7:To use the Scavenger to revive somebody make sure it is Pack A Punch after round 27 and then when you are by the Teammate that is downed shoot a Scavenger bullet and wait one second and start reviving them all the Zombies will go BOOM by the time you are done reviving!
Tip:Make sure you have Juggernog and PhD flopper to do step 7."
-Good point and this is actually how I use this weapon in the game. Scavenger Hyena Infra-red is not required. On very high rounds (27+), one shot anywhere near the downed player is not enough as zombies move too fast at this level, by the time you have finished reviving (even with quick revive), they are all over you and it will be too late to fire another shot.
On levels 10-25, fire 2 shots near the downed player. Higher levels, 3 shots are a safe bet. On levels 40+, yeah, you need the Hyena.
Like running circles or forming trains?, this weapon is your best friend, fire one shot on the ground and circle it. Ka-boom and you're all alone.