Boom was acting far more nervous when the Caravan arrived at the sink-hole. "In the den of viperses." He nodded towards himself as he glanced to his side. "Yessss, its not good for Boom." He kept his position on all fours as he crawled when approaching the checkpoint to the Kokiri Sinkhole. 

He darted an eye-upwards to see if the check-point was guarded. It was. Boom immediately shot his head back to glance down. "Hisssss..." He glanced back up to see the Deku approach the guard. "The thing that speaksssss only paaaiiiiin." He turned his head sideways as he nodded. "It deals with the guard."