Round 1 - Monsters get initiative.
The six hobgoblins close with you and really Si'Nat, since he's the one in the doorway, and so only one can attack him. He does a mighty good job of it though, hitting him with a solid strike that only his armor was able to prevent any damage.
Si'Nat fires a shot at the one on the throne but misses.
Round 2 - Party gets initiative.
Si'Nat moves away from the doorway and throws his flask of oil on the ground (he only had one) and moves away from the door 30'. The rest of the party follows him, getting their missile and melee weapons ready (I assume).
The hobgoblins burst through the door and splash through the oil with little problems, catching up to the party and now can fight two abreast in the hallway.
Round 3 - Party gets initiative.