It was also the will of fate (or it could be argued that it was). As it was the Phoenix Gate that initiated the loop of the Archmage rescuing himself and which in turn brought him to the sisters to rescue him. He did it because he saw his future self do it.
The sisters could simply have been following what was fated to happen.
Aldrius
posted @ Sun, Jun 6, 2010 10:48:57 pm EDT from 173.206.120.17