What's that smell?

Trooper is normally a bit gassy especially when he is sleeping. Lately however he has been extra stinky. I'm talking room clearing stinky. The ultimate silent but deadly. I'm not sure what he has eaten to bring this on. We haven't changed his diet, however with Trooper it could be anything.
In a curious twist, his farts have been moving in a linear fashion. Whoever is sitting directly behind him would get the receiving end of smell. And it tends to move slow for some reason. He has slow almost projectile farts. I plan on renting Trooper out as a tear gas agent to the police. Maybe he can pay back some of the stuff he has ruined.