Body Hopping.

The divine power destroyed the tentacle while the godfire traced the tentacle back to its source. The fire burned everything along the way until it reached the host. 

Legion-7 survived the backlash. His soul is stronger than a Supreme Origin god in terms of quantity. Malekite is just a low god, the equivalent of a lord of law. Even though he is weak to her god fire since it is a flame particularly proficient in burning and refining spiritual matter, it still can't threaten him. 

He managed to break off the tentacle before the god fire reached him. But the soul of the host didn't survive the backlash. It broke apart and was consumed by the god fire. 

Legion-7 complained from within the burning wreckage of his host, "Even a weak god is not easy to hunt. Her godfire didn't even leave me the scraps of the fragmented soul to consume."