Troubleshooting help needed-AC pressures

What makes me a little suspicious here is the fact that it didn't change RPMs when the clutch engaged?..
If it's leaking out one of the Schrader valves that's a great easy fix but on the other hand it's hard to detect because there's always a little bit there from when you put it in. So your black light will show some there whether you've got a leak or it's just where you put it in at...
But again the compressor not dropping the idle down one or 200 RPMs is a little odd to me...