The person you chose deserves room to solve the problem before you take it back.

Taking a task back at the first sign of difficulty is usually explained as urgency, and it teaches something you did not intend: that the handover was conditional, and that struggling briefly is the same as failing. The person then works with one eye on you rather than on the problem. You also never find out what they would have done, which was the point of choosing them.

Agree in advance on when you would step in: a date, a threshold, a particular kind of trouble. Until then, offer help rather than rescue. Sitting with your own discomfort for a few days is often the whole job.