Didn't have a clue about this so did some reading
It seem that it is not respotted, as you do not respot the on ball if it is potted during a valid free ball situation.
Quote:
Originally Posted by http://www.ibsf.info/rules-snooker.shtml#2_13
(d) If a ball on is potted, after the cue-ball struck the nominated ball first, or simultaneously with a ball on, the ball on is scored and remains off the table.
It also may not have been a free ball to begin with, as it sounds like the ball was angled rather than snookered. Snookers require the angles to be blocked by other balls, not the cushion.
Quote:
Originally Posted by http://www.billiardworld.com/snooker.html
Angled: The cue ball is angled when a direct stroke in a straight line to any part of every ball on is obstructed by a corner of the cushion. If there is any one ball on that is not so obstructed, the cue ball is not angled. If angled after a foul the referee or player will state "Angled Ball", and the striker has the choice to either (1) play from that position or (2) play from in hand within the Half Circle.
and
Quote:
Originally Posted by http://www.ibsf.info/rules-snooker.shtml#2_16
(e) The cue-ball cannot be snookered by a cushion. If the curved face of a cushion obstructs the cue-ball and is closer to the cue-ball than any obstructing ball not on, the cue-ball is not snookered