The mercury was then driven off by heating, producing deadly vapors.

It had identified the unknown gas and nullified the deadly vapor.

The deadly vapour of its breath 2735 swept on before it.

It was a deadly vapor that would kill within fifteen minutes.

Dragon Sand made deadly vapors only when it touched a solid, such as stone.

Before them lay a pit, out of which the deadly cold vapour was still drifting up.

That action stopped the passage of the deadly vapor.

They waited impatiently for the deadly vapor to clear out of the tunnel.

The huge globe of beautiful, deadly vapor was lifting!

Whether it would be tear gas or a deadlier vapor had not mattered.