...Good idea.

*Shoves the spear in a separate, rune-sealed iron pillar far away from Rebecca. However...*

*Rebecca, in response to your death threat, breaks out of the iron pillar AND destroys the runes through sheer force of will, does it twice to retrieve her spear, breaks the PAKALRAIMUNJITSUGIYAOIKUBRANAMELODOGMON with an Anti-PAKALRAIMUNJITSUGIYAOIKUBRANAMELODOGMON spell in record time, and not only "kills" you again, but now starts showing her tanky side, as it takes Tazz (a Glass Cannon with multiple selves) several seconds to subdue her again. In the meanwhile, she combo-"kills" you until you're broke and out of EXP for your next level. He TOLD you not to threaten Rebecca! HE TOLD YOU NOT TO THREATEN REBECCA!!!*

*Tazz, upon KOing her, seals her in a diamond tomb, seals her weapon in a second diamond tomb, and runes it up to the high heavens. She can't hear you this time. If she escapes from this, he's out of options.*

Tazz: OK, if it prevents her from escaping from THAT, which is, PS, my last prison, the answer is no, you cannot do jack s**t to her, we could use her as an ally if your big mouth doesn't annihilate our chances. Don't even suggest anything we can do to her aside from just keeping her imprisoned. This is getting ridiculous! She's human! If she was a demon, that would totally justify it, but she's not!

...Oh, wait, wait, I may have found the next Superdimension entrance...