But listen, the guard that told the girl to keep moving?

From here, the guard can keep an eye on the train in case of problems.

Donald tried to go to her, but the guards kept him away.

But guards kept an eye on everybody all the time, so that didn't seem out of the ordinary.

The guards kept looking at him and shaking their heads.

His guards could keep her alive, in that he felt secure.

Guards kept people out; the mail and the telephone came through.

Guards kept people away, because the building was still smoldering.

But a fine guard you keep in the valley: he was up here a day before all this racket.

The two guards behind him kept aim on my friends as we put a few steps of white deck space between us.