Isidora crashed to the floor as she, Richard, Lucian and Henrik appeared inside a well-decorated study room, panting with the exhaustion of having to take the three men with her when she teleported from the Wiccan tower; and even more so because she still wasn’t fully recovered from consequences of healing Henrik or Fara’s attack on her. In truth, the dark witch would already be dead if she wasn't the wielder of the Dark power.
Thing is, when Isidora had healed the squire, she hadn’t actually done it entirely on the basis of her magic; in fact, dark magic didn’t have a healing aspect. What she had done in reality was forcefully pass some of her life force into Henrik's soul to make up for his dying own, which would definitely had killed any other dark wizard that tried it but fortunately
