From <Someone>:
Pet picks up 8 spears.
Pet wields 8 spears.
Pet thrusts its spear at Foe.
The routine to handle a monster attacking the hero are already uses "mon
thrusts one of its spears" in this case, so make monster against monster
messages do the same. Also, it's no longer necessary to save one monster
name before formatting another when using two monster names in the same
message, so switch to the more straightforward usage here. (The Blind
check is needed in the mhitu case but not in the mhitm one, where it's
redundant because the caller has already verified that both monsters'
locations are visible, but I left it in.)