The main obligation is on the catcher to avoid contact with the bat or batter. ASA 8-1-D
For batter's interference, ASA 7-6-P-2 requires intent in this situation. Given the situation (steal, probably a fake bunt to "legally" block the catcher's view and draw in the infield), it wouldn't take a lot for me to consider pulling the bat back into the catcher to be intentional.
However, you mentioned lower level 14U. The catcher was probably anticipating the steal attempt and trying to reach a bit to catch the pitch early. The batter was probably just clumsily executing a fake bunt. I see nothing wrong with a "no pitch" to have everyone reset. Call it "lower level game management."
