8) Checks the alchemist's potion
Gur was most likely an alchemist. Today, there is no mention of this role.
Maybe there’s just no effect – that’s two.
He might be hiding – that’s three.
Gur could have been a Sorcerer/Physiomancer – they have beards, and they don’t have Night Watch.
Except for the hydromancer Kosti, all the town Night Watch members are alive.
Added 6 minutes later
Tell me, how should a true townsman behave?:) Should he wait until he is killed at night, and then humbly write "I suspect everyone, but I'm afraid to accuse the wrong person"?
And a "true townsman," a patriot, should be sure of who he is hanging. And consider all options