Thanks! Just let me tell you that wherever it is going, it is going to get there fast. I know the last couple of three chapters had been kind of slow, from the point of view of the plot moving forward, but the time for slow progress is over. The next couple of chapters are going to reveal all the surprises I had in stock for this story. I hope that you'll like where it goes. 

As for the specifics: Casey is clearly stronger than Lisa. After all, she has learned to fight in her 6 years in a maximum security prison, while Lisa has recently been a mom and was working as a kinder garden teacher. But Lisa can still hold her own. Part of it was her old training in martial arts, another (more important) part is survival instinct and finally, there is the very important contribution of her physical enhancement. Like Casey (and Kelly), Lisa is not only bigger, but she is also stronger than she should be for her size. Of course, her opponent is also stronger, but in the end, their increase strength makes them last quite more than they should in a fight.

As for the effect of the gas... well, next chapter will be posted next Saturday :)

Hope that you will enjoy the rest of the story. Cheers!