Jon held the stone and shrugged, thinking there must have been a reasonable explanation as to why the wishing stone was completely red now, then he made a wish, thinking (foolishly) that the stone would function normally. But, of course, it wouldn't.
"I wish Sarah would come out," Jon said, thinking that the stone would force Sarah to come out from hiding behind those shrubs. But the Republican Stone had other plans.
The stone glowed, granting and twisting his wish.