I get all the way to the part where you have to start the ritual with the runes. The runes are all in the right place and the ritual starts, but then Ariane doesn't get hit with the beam. The Head Zamorak wizard does and then it cuts out. I've done this like 5 times and it's still the same result. Then, it still shows that I need to do the ritual again. Any ideas as to why it's doing this?

You are lagging between 2 cutscenes causing it to break. Try turning graphics down and doing it.

Thank you ^_^