And see that you don't let your foot slip.

For if you do, you know what'll happen to you.

Now get out!" Barney got out, again protesting that he would not be found failing.

He was not greatly disturbed by what Barlow had said.

Every so often there had to be just such sessions, and every so often Barlow had to let off just such steam.
Barney's errand was done.