A_NoBlocking
From ZDoom Wiki
A_NoBlocking
A_Fall
(no parameters)
Makes the actor non-solid and spawns all drop items. The drop item list is not cleared so it can be executed multiple times. Alternatively you can use A_Fall which is Doom's original name for this function.
Examples
This function is typically used in an actor's death state, as can be seen in this DECORATE code from the Doom 2 ChaingunGuy.
Death: CPOS H 5 CPOS I 5 A_Scream CPOS J 5 A_NoBlocking CPOS KLM 5 CPOS N -1 stop
Note: This can be combined with A_Scream using A_ScreamAndUnblock.