the sound of heavy footsteps

smoke, vapour

threatening, full of threats, with threats

blow up

threaten, intimidate

be coerced by threat, be frightened, be scared

to detonate a bomb, etc.

threatening, threat, menace, reprimand, snubbing

a loud report (as of a falling wall, or a gun), crack, crash, bang

explosion

explosion, blast, crash

bomb to go off

threaten, intimidate, terrorize, chide, scold, bully, menace, daunt, make threats

an explosion

be intimidated

explosion, blast, crash

Gabriel

detonator

to take pity (on), to show mercy or kindness (to)

to feel pity (for), be touched with compassion, to take pity (on)