the ferals were at least some use once having gotten over their fright ; one of the littler fellows , hertaz , greenish yellow stripes over dusty brown , proved their best hunter in the summer-yellowed grasslands : he could flatten himself in the tall grass and hide downwind while the other dragons stampeded animals out of forests and hills with their roaring ; the hapless beasts would run very nearly straight into his path , and he often brought down as many as half-a-dozen in a single lunge .