У вашего броузера проблема в совместимости с HTML5
First of all, I take no credit for this technique. All credit goes to OMGWTFBBQ99 of GameFAQs. You can find the original gameFAQs thread describing and discussing the method here:
http://www.gamefaqs.com/boards/693331-dark-souls-ii/69052531
So I know you're going to ask even though I explain it just fine in the video, so here. You kill him while the flame is in the upper right, then you go in the boss door IMMEDIATELY, and quit. Just normal quit. So PSN or XMB or pulling the plug on your console. Just quit. That's it. Do it again and again until you get what you want.