The sheer level of big brain energy going on here is mind-boggling.

Duplicate's curse, thus forcing the curse onto itself.

Capture both with one pair of handcuffs so neither can go back into their own portals.

Different "tortures" of each, though since they are both the "same" curse if affects them the same.

Watching his "torture" of the curses with the curses and recording it on the very tape the curses came from.