--- Kat ---
The turning point started slowly, and entirely by accident. Before that point it was very much a matter of trying, and usually failing to contain them in some way and just prevent more copies from showing up and screaming like lunatics.
Things changed when Meg casually threw one of the Trvis into another near to Kat. It was sneaking up behind her, and while Kat was aware of it, she did appreciate the assist. The funny thing was, glancing back, when the blob reformed it split into two people. At first Kat didn't see anything wrong with it. Just something niggling at the back of her mind. Of course there's two Trvis, that's normal.
Meg clearly noticed something odd as well and threw a few more Trvis over Kat's way. Some of them split into two… but others split into four. It was Lily watching from above with a clearer view of things. [They don't split as much! If you 'kill' two at the same time with each other they just reform as if only one has died!]