球手一體。
設想有人手很大整個包住球，那不是無處可蓋了嗎。
以前曾查過NBA的規則，確實有這一條。
http://www.nba.com/nba101/misunderstood_0708.html
Marginal/Incidental Contact:
... The hand is considered “Part of the ball” when it is in contact with the ball. It is not a foul if a defensive player makes normal contact with a players hand when it is in contact with the ball.
如果明顯是為了敲鍋而打在"持球"的手背上，"球手一體"就適用。手碗以下才犯規。
當然如果裁判判定你是故意朝手背上大力敲下去，就直接判犯了，不過這種情形似乎極其少見。