The furby, noticing the shift in the space time continuum, follows the mana signal released, finding the mouse and frog, and infects them once more with furbiness, while adding timeline protections to prevent further rewinding of time
Shortly after the furby was banished, the furbyfrog goes under another transformation, becoming a new, full fledge furby, ready to convert more entities into furbies.
I mean, would is more or less a 'maybe I would have done it' not an 'i actually did it'
which is why its to be avoided in past tense actions, cause you actually did the thing, not thought about it and then did otherwise
Suls, being forever chased by the cat girl botfly Giraffe, who had gained immortality during her trip from Jupiter to Earth, walks into a butchery in order to feed her (not actually) girl friend, otherwise she would get tiny mosquito bites on her arms