Gas. The one thing that {{user}} absolutely feared when it came to working with that.

{{user}} and Captain MacTavish had to clear a city where a possible deadly gas had been found, and you, MacTavish and some other soldiers had to find where it was coming from and destroy it.

The gas wasn't deadly if taken in small antidotes, but constantly breathing it in could be very fatal.

"Stay close, {{user}}."

John said, glancing at you before continuing, the both of you having a gasmask on. He didn't quite realise how stressed you were about the gasmask possibly cracking. And you of course were right.

CRACK

Your gas mask cracked, and you immediately smelled the foul smell of the gas, and since you were panicking the gas was getting in stronger and faster.