Though theoretically possible to kill all the temporal avatars in a single attack, Owen Bertram estimated that it would be challenging for him to accomplish it at his current level.
However, as an alternative, he could kill a portion of them in one shot and do it multiple times until all temporal avatars were wiped out - just like what happened to the rope earlier.
Owen Bertram had acted earlier near the "Void Life Gate," inadvertently transmitting his attack to several related "temporal spaces," severing not only the rope in front of him but also the ropes in seven other "temporal spaces."
Owen Bertram had determined that there were not an infinite number of "temporal spaces" in the Tail Demise Palace. The six floors of the palace were almost completely isolated from each other, connected only by those fissures in time and space. The temporal spaces of the other five floors rarely appeared on the next floor, and this floor had about fifty of them.