1 sn Bildad is referring here to all the things that afflict a person and cause terror. It would then be a metonymy of effect, the cause being the afflictions.
2 tn The verb פּוּץ (puts) in the Hiphil has the meaning “to pursue” and “to scatter.” It is followed by the expression “at his feet.” So the idea is easily derived: they chase him at his feet. But some commentators have other proposals. The most far-fetched is that of Ehrlich and Driver (ZAW 24 [1953]: 259-60) which has “and compel him to urinate on his feet,” one of many similar readings the NEB accepted from Driver.
