Tā duì tóngshì de kùnjìng lěngyǎn-pángguān, méiyǒu shēnchū yuánshǒu.
He watched his colleague's plight with cold detachment and offered no help.
Tips
usage
This idiom often carries a negative connotation - the bystander could help but chooses not to. It can also mean to observe something critically from a detached vantage point.
