Pins knocked down by pins rebounding from the sidewall, machine, rear cushion or any other object in the deck or pit area shall count as pins down. If a downed pin is caused to stand erect again in the playing area, it shall be judged as down and shall remain on the lane to be played as wood. A bowler must wait until all wood has halted motion under penalty of foul. However, if the wood has apparently stopped rolling and then starts rolling again while the player is in the act of delivering the ball, or while the ball is in motion, there shall be no penalty. The bowler resets and is entitled to three balls in the frame.
Second ball is fairly delivered but before making fair contact, pins fall.
Bowler is credited with spare. A player in delivering the ball must not let his action cause him to slide over, step on or over the foul line, nor permit any part of his body or clothing to come in contact with the lanes, gutters, ball returns, division boards, walls, uprights or floors which are beyond the foul line, at any time after the ball passes over and beyond the foul line, nor until he shall have picked up a ball and completed his succeeding delivery, under penalty of foul. Any object which falls from the pocket or person of a bowler shall not constitute a foul. Bowlers are not allowed beyond the foul line under any circumstances. When a bowler accidentally fouls while taking a practice slide, the bowler will lose that ball.