I think it was a matter of match ups with Visul, the setup of the 2 witches which probably went against her, even if she was much stronger.
With her holding back against the zombies she had to deal with a witch that could match her movements as well.
I think Visul would have had the 2 witches eating dirt if she wasn't holding back against the zombies.
Taras abilities were a better match as he could simlpy handle the witches and zombies no probs.
No holding back in capturing the witches for him, kinda seems like a family motto
On the note about Varete, I really wonder what kinda role she will play later.
I don't quite see her betraying the witches by going over to the WH side.
With all the comments about how powerful she is/was I would think she would be doing her own thing but I'd guess she is duty bound to her servitude. We'd probably see something about her trying to break whatever bounds her before she jumps ship.
More than anything about her I want to know what her relationship is to Tasha, is she her older sister? mother? lover?
I could see mother work out or maybe even sister but lover kinda pushes it.
Theres actually quite alot I want to know but we get more questions than answers popping up with every passing chapter.