Sorry to be late to this part of the thread, but in what issue(s) did this Cass vs Jason fight happen?
In general, I'm kinda bummed by Hill's portrayal of Cassandra's fighting prowess. I thought JTIV did a good job somewhat detuning her but keeping Cassie at the top of the Gotham martial artists. Cass wipes out Nightwing in BRE001, Bruce tells (I think) Barb that he can't beat Cass, and of course the her epic League of Assassins demolition was great.
In issue 006, Hill has Cass one shot by a super and then mom wipes her out while taunting her the whole time. Plus while Cass's dialog is choppy, I'm not feeling the right vibe about what she says much of the time. Trash talking in particular seems very un-Cassie.
On the upside, I am very happy to have Cass in print and not banished in DC's limbo.