User blog:Victory awaits/Can witch overpower an Archangel?

According to Don Stark`s (the witch who stunned the Leviathan in the hotel) magical skills, it is known that extremely powerful witches and wizards can harm or maybe even kill such powerful creatures as  Leviathans. Knowing that witch`s lifespan is potentially unlimited, could an Archangel be killed by witch who increases his/her power with time?