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Throwing
A rock is a plan
Short answer
Pull infected. Signal the duo. Don't greet a room with a grenade unless you meant the explosion page.
Also: throw · throw stone · throw rock
How it works
Most held items throw. Stones and chemlights pull or mark. Grenades are a different sentence. No distance chart here.
What to do
Need a doorway empty? Throw past it, wait, melee.
Don't
Don't cook a grenade as a greeting.