Welcome, Martin, over from the apprently defunct NFHS Official's website. Let's throw some mud on the play : (1) B26 intercepts pass in B's endzone; (2) B26 then knees A88 in his baby production region; (3) B26 then fumbles and ball bounces out to B's 5; (4) A's big ole' Bubba - fresh from watching the World Cup - recovers the fumble and promptly drop kicks the ball thru the pipes . YOU MAKE THE CALL.......
First off, B26 has disqualified himself from further participation for the rest of the evening unless that was an accidental knee. We have a flag for that, and a second flag for A's illegal kick. B gained possession, and then lost possession of the ball, and A got the ball back with clean hands.
If A accepts the penalty on B26, we have a double foul; flags offset, replay the down.
If A declines the penalty on B26, then B will most likely decline the flag on A(Bubba), because Bubba forces the ball into (and out of) the end zone, where the ball is declared dead, so it would be a touchback, with B's ball, 1st and 10.
Now, if that was an accidental knee to the babymakers, there's only the one foul on A(Bubba). Bubba still forced the ball into (and out of) the EZ, so B will decline the foul and take the TB.