I already stated I'll go behind. I'm a bit confused by the door on the "north" of the map, that doesn't go out on the street? I mean, the backalley ("east") seems too far for stated distance
"About twenty five feet away from the door from the table with the laborers an additional twenty feet from the caster" so I think this was misunderstanding - this states the distance to the front door.
The question was if he starts running, when will he be able to rejoin the fight.
@TaranTheWanderer cast your spell - if most of them get disabled we can sneak attack them to oblivion.
@OneCrappy DM if there is no easy way around the building, Luke would not charge around - if he cannot join in second - or at least be fully ready at the start of third round (with stealth) he wouldn't go.