WLP644 Brett Trois and Blow-Off

I recently brewed an all Brett IPA (you can see another thread about it in the general forum here
http://forum.northernbrewer.com/viewtopic.php?f=1&t=117613
).

Brew day went fine with basically hitting my est og at 1.052, I pitched two vials at 65, and set my 6.5 gal carboy in cool area to keep temps in the 67-72 range. Fermentation was going fine but at some point I had a blow-off. Definitely wasn’t expecting this with an all brett fermentation.

Has anyone else experienced an all brett primary fermentation blow-off, especially when using Brett Trois?