well i dont know about debuffs but description of turn to stone talk about only damage : "Petrifies oneself for 8 seconds to avoid incurring damage."
edit :
also when enemy are in state of dance of medusa they should can get dmg and debuffs :) you cast dance of medusa on enemy to petryfy them ( stun) so you dont help them to cant get dmg and debuffs ( my opinion )