Katia plants a delayed restroom explosive to map Desperado guard behavior and secretly Size-Up Astrid.
Days before the operation, Katia places a cherry bomb in the men's bathroom timed to detonate while she stands across the club. The indirect placement keeps her away from immediate suspicion.
Astrid does respond, proving the security route, but only after almost an hour. She briefly emerges to scold guards and then returns to the office.
The delay makes a second generic explosive unsuitable for the final lure. Samantha's highly visible disruption should demand a faster appearance.
The test still succeeds in two ways: it confirms Astrid uses the hidden corridor and gives Katia a clean window to drink Size-Up and record the fairy's complete build.
A tiny restroom bomb detonating while a hidden observer maps guard routes and scans a distant fairy.
The test supplies Astrid's route and abilities while eliminating explosives as the primary lure.