Ball spells don't make neutral monsters hostile
Casting a ball spell next to a neutral monster doesn't make them hostile
As the title says: casting a ball spell next to a neutral monster ("-foo- does not care about you.") doesn't make them hostile, despite them being damaged by the spell. Throwing an improved fireball at a neutral monster doesn't make them hostile either.
Only affects neutral monsters; friendly monsters and companions seem to get hostile as expected if hit by a ball spell.