exactly what scheczudio said: OK, but not as good as the others.
Let's call em grabby punches, but I don't see the use of distinguishing between "grabby punches" and "nubclaps" since both are nooby moves with hands that involve grabbing... actually I don't know the difference.
Yes, you don't have to, and shouldn't do everything with your feet, but you don't have to grab to punch.