Interesting, having the candles held up by ropes, I'll have to remember that....

If I see this right, once the candles are sufficiently burned down they will set the ropes on fire, making Azusa flip downward (she's still be held aloft by the ropes tied to her legs) with burning ropes on her body. That's going to be extremely painful if she cannot pull free. Worst case would be that she is set aflame before that.