[BUG] Soul Eater can be used to extract cores from own creatures

Version: Android 1.3.21

Steps to reproduce:
In a battle, use creature equipped with Soul Eater to attack and kill an extractable creature in your own team. After killing it a core will be extracted from it. This can be done only once, when repeated, the “Already extracted” message will appear (the already extracted status persists between battles, might be reset after breeding, didn’t test).

Seems more like an unintended effect and not a bug