Fire into the hole. Watch out for grenades. The reason for shouting this sentence is to remind teammates to be careful of their flashlights, grenades and smoke bombs to avoid being flashed by their flashlights and injuries (of course, this function will be useless if the server is turned off). The second reason is that many tactics in the game use this sentence as a command. Many Grenade tactics are that several people run in the hole after catching up with the fire. As a signal, this sentence is more useful, so study it more.