Infraction: 3. All discussion should be both polite and civil.
Message to User:
If you don't have anything useful to contribute, and you can't be polite, don't post.
Why would you waste a GCD/rune on the Vile Spirits. You might look better, until someone opens your logs and notices you were padding your damage.. Just like Death Knights that waste a blood rune pestilencing inactive valks...
If you are looking to pad your numbers, yes you can reach spirits and valks with pestilence. I'm not sure if you can increase your range by jumping, or if pestilence goes further based on your race. I also am unaware of a reliable way to test that.