#353 Bullets not used up when fired upwards

[Christian Cooper]

Firearm projectiles such as bullets, grenades and
rockets are not used up (in the case of bullets) or
armed (in the case of rockets or grenades) when fired
upwards (<) or downwards (>) using a relevent
launcher, which seems inconsistent with what happens
when they are fired in other directions.

"A bullet hits the ceiling, then falls back on top of
your head.--More--"
"A bullet hits the floor."
"You see here a bullet."