"Kili!" Fili shouted as he tried to warn his brother of the approaching arrow. Kili turned towards his brother's voice but wasn't sure what he was trying to tell him. 

Growling under her breath, Mel fitted an arrow to her bowstring and shot an arrow in Kili's direction also, hoping the arrow she had fired would intercept the one fired by the Orc- if there was at least a chance he would only be hit by her arrow he would still be better off; she would have to apologise to the dwarf later, if she ever saw him again. It of course also meant that she would have to resign to the fact of giving up the dwarf prisoners, if Kili could get the gate open even the elves couldn't run fast enough to keep up with the current in the end. 

"Aaahh!" Kili yelled in pain as an arrow embedded itself in his leg, collapsing onto his knees for a brief moment. He was lucky; Mel's arrow had knocked Bolg's off course and sent it flying into the undergrowth somewhere, hitting the dwarf in the leg instead. Pain still seared through the wound, and Kili clutched at the shaft, hissing through gritted teeth in pain. But he couldn't give up. The lever was right there, he could just reach it, if he just stretched up. Managing to grab it, he pulled as hard as he could, and the gates swung open, sending the barrels tumbling suddenly down river and into the rapids. 

Staggering to his feet groggily, Kili jumped off the side, landing in his barrel again. The shaft of the arrow caught on the side of the barrel, snapping off and making the young dwarf yell out loud again.