Well, he looks that way sometimes
Literally: neck – mouse / rat – both – edge
Alternately: Caught in indecision, often between two choices. Vacillating; sitting on the fence. By extension, the phrase can also refer to someone who is gauging a situation before deciding what to do or which side to throw in with. The image is of a rodent sticking its head out of a hole and looking around as if unsure which way to go.
Notes: This is another extract from our old friend, the Records of the Grand Historian (Japanese 『史記』 = Shiki). It is considered a synonym of “last week’s” 遅疑逡巡.