Drill Clone turns the drill off. and turns to the guards "What would you guards normally do in this situation?". Meanwhile Orig. thinks
Guard Clone go stall the guards I'll be there in a sec. Guard Clone holsters his pistol and walks out to the main lobby casually nodding to the new guards. Orig. runs down the stairs and gets the .22 from Drill, leaaving behind his pistol and walks to the top of the staircase, before crouching and sneaking into the office they drilled through.
Spoiler
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Disguise - (1d20+16)[34]<- I'm including the ten from the alter form thing.
MoveSilent - (1d20+2)[21]Hide - (1d20+2)[14]