Adam Clarke on Numbers 22:26

And the angel - stood in a narrow place - In this carriage of the angel says Mr. Ainsworth the Lord shows us the proceedings of his judgments against sinners: First he mildly shakes his rod at them but lets them go untouched. Secondly he comes nearer and touches them with an easy correction as it were wringing their foot against the wall. Thirdly, when all this is ineffectual, he brings them into such straits, that they can neither turn to the right hand nor to the left, but must fall before his judgments, if they do not fully turn to him.