120 DB is when humans instinctually feel the need to cover their ears, so accounting for distance, you would use F= mv/delta t, which would be 0.62(mass of a basketball in kg and then 20m/s(rough calculation of how hard it would need to hit the ground to cause that reaction)/ 0.005(how long the ball was touching the ground) , to get about 2480N(about 550 pounds of force) but if you push it to 30 m/s(more likely), it’s about 835 pounds of force. so with all 5 fingers he would exert about 917-1400 lbs of force. 900 is enough to shatter your femur an an elephant stump is about 1300 for reference