Villainous Rescue

It's true that Villains have a cold heart, but sometimes redeemed Villains decide to make the right choice if feel they like it or not

The reasons can be many. Maybe the villain...
 * Is The Only One Allowed to Defeat You.
 * Still thinks you're his best bet against the villain he's saving you from. This can be Big Bad versus rival Big Bad, or The Dragon using you against his master for good or not-so-good reasons.
 * Wants to gain your goodwill in order to betray you later.
 * Hates the other bad guy more than the heroes.
 * Is just very, very hungry and doesn't care what he eats.
 * Is an Anti-Villain (or even Good All Along)
 * Wants to run the world, and the other villain wants to destroy it.
 * Has a plot in the works that requires the heroes' continued survival to function.
 * Is a bit more affectionate towards the hero than they admit.
 * Simply feels that losing to another villain is an unworthy end for the hero.
 * Has a cordial relationship with the hero or really, genuinely is the hero's friend and does not want the hero to get hurt. Or at least not unnecessarily when it's not a matter of foiling the villain's important plans.
 * Has good, if somewhat extreme intentions but otherwise protects those that cannot protect themselves. Luckily, they respect the hero enough to include him or her under that category.
 * Was done a good turn by the hero at one point such as the hero saving them from certain death, and the villain feels he owes them a favor. The rescue will probably end with the statement from the villain, "Now, we're even," and the usual antagonism resumes as before. Alternatively, the villain would genuinely treat the hero as his friend, but not the others.
 * Maybe it's genuinely a coincidence, an unintended consequence of an attack on a rival. In this case, the villain is probably not all that happy that he just saved the hero's hide.
 * Has Amnesia because of the last season's events and only remembers the Hero's name, thus decided to help him/her because he feels like it. Can be faked out of remorse.
 * The villain doing the rescuing simply thought it would be funny to mess with the other villains scheme, doesn't actually have any personal stake in the matter and of course it's always possible that it isn't a rescue at all.

The villain gave the hero a Hope Spot, the relief of escaping from his enemies, it's possible for him to destroy that hope himself.

Examples

 * Megamind rescues Roxanne and all of Metro City from Tighten, but by that point Megamind was well on his way to completing his Heel–Face Turn.
 * The Lizard saves Spider-Man from falling off of a building after his Lizard-ness starts to wear off and he regains his mind.
 * Jason Voorhess actually pulls this off a few times in the Friday the 13th series. For one, Rennie is being attacked by two gang bangers and Jason kills them (and proceeds to try and kill her afterward) in Jason Takes Manhattan. And who could forget the scene in Freddy vs. Jason when Jason stabs Freddy with his own clawed glove as he is about to kill Lori and Will.