Maybe we're both confused here... I assumed you wanted to climb to the roof (or close) of the inside of the warehouse but still be within 30ft of most of the combat). There are no real cover there.
IF you are on the outside of the warehouse, you can't see inside, no holes on the roof (one of the few things they repair, keep out prying eyes).
SOOO if you want to be outside, you could not attack Fat Mic, nor could Fat Mic attack you. IF you want to be inside with cover you would be farther then 30ft away so no Surprise Strike but Fat Mic would have missed you. I can edit
As for Torrin, I might have mixed that up, but I did not think you could hide on the round that you attacked? Can edit that also