How does a BM deal with BF?

I havn't fought him recently but I did fight him a few times right after they screwed it up. What I noticed was that you can still pin him with hurricane when he's hugging the wall, but he can easily get close to you when you have to recast spells. Before you had plenty of time to recast spells and even if he got out of corner you can push him back with hurricane alone. Now, I had to use puppet right before casting spells to hold him in place which did work most of the time since he kills puppet then runs back in the corner mostly. If you have others attacking it at same time you can't keep him in corner. When I tried this with NL buddies, as soon as they land a hit he starts running at you. So its a bit easier to solo than in party.

The only way I was able to get him into the corner was to hit him, run into a corner and wait for him. Then puppet and go in trade shop/cs and come out. If he's in the corner then attack him if not try it again.