he was enthralled by the synchronicity and cohesiveness of their movements , watching a group of twenty or more move as one - ash boys leaping almost to the roof , their sooty limbs visible only for the trail of sparks that came with their whoops and hollers ; wacabe , looking in all ways like immense black bears , but able to move with such delicacy and speed that there was no way to mistake them for one ; and the small ohdowas , who guarded all beings who lived here though they themselves hardly reached oisins thigh .