You're in a passage so only Rondo and Si'Nat can attack. And they already closed to melee. However, because Rondo is a dwarf, Cugel is able to shoot over him at his attacker. He misses by a long shot though; perhaps marching through the long, twisty passages dulled his aim?
Kurik also takes this opportunity to fire at Rondo's attacker and hits with a solid shot.
Si'Nat swings at his attacker and kills him with a single blow!
Rondo attempts to do the same to his wounded attacker but just barely misses.
Round 3: Humanoids gets initiative.
Unphased by the loss of one of their party, the two remaining humanoids fight on, with the third one stepping in place of the fallen second to attack Si'Nat. Both actually hit Rondo and Si'Nat, but the strength of their armor saves them from any damage.
Cugel fires and this time hits Rondo's attacker with another solid shot, yet again he seems nonplussed.
Kurik shoots but misses.
Si'Nat slices into his opponent's chest.
Rondo surprisingly misses his opponent again.
Round 4: Humanoids get initiative.
This time, Rondo and Si'Nat easily avoid their attackers.
Cugel misses but Kurik hits with his arrow and brings down Rondo's attacker.
Si'Nat and Rondo swing at the last remaining attacker but fail to connect.
Round 5: Party gets initiative.
Since Si'Nat is still in front of the last attacker, Cugel and Kurik can't get off any shots.
They're not needed though as Si'Nat brings his sword down on the attacker's head, splitting it in two.