That's not the problem.
Spoiler
The syringe is filled. I'm already hiding behind the left pillar. But as soon as I use it on Pete, he's greeting me (What are you doing there, how did you get in etc.) As soon as I want to step away I get: no, he might see you...
btw, I filled the syringe while hiding behind the pillar...
btw, I filled the syringe while hiding behind the pillar...
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