Did you say you got there first, but there was already a queue? Then you checked later and different cars were there? That would suggest you were next, unless the 1 guy had been there the whole time.or I could have left a note for the Volt owner saying "plug yourself in if you get back.
As it turns out I got about 1 hour of charge and I believe the Volt owner checked his car, saw me plugged in, unplugged me and plugged himself in.
Didn't bother me particularly though I would love to hear the Volt owner's take on how I should have approached the situation and whether he thought I was fully charged (Volt and Bolt, I believe, have the opposite blink pattern to indicate charge status) or if it was just an "I was next".
I'd have done as you had, though I maintain that it isn't a wise practice to count on free L2 charging to complete a trip.