Sans had just closed his eyes when he heard the deliberate crunching of footsteps headed in his direction, and at first felt his soul freeze in horror. No one in all of the Underground, not even Undyne, knew the full extent of his powers, and he fully intended to keep it that way. His powers, while initially thought of as an ultimate blessing, were barely half that for the short skeleton. 

He remembered pain, enough that he thought he might die, so unbearable that he was ready to give up, and that's when his very first blaster appeared. The huge, animalistic skull had given a primal cry before launching a beam from it's disfigured maw at his attacker. But that was it. He couldn't remember anymore than that snippet of agony and terror. And he didn't want to be reminded of the short memory by being quizzed over his powers.

"[I]You know, Sans...I was thinking. We should train together."[/I]

At that, the skeleton let out the breath he didn't realize he'd been holding and relaxed back into the snow. Thank the stars. It was just Frisk. She had never questioned his attacks, having seen them so many times before, and he knew she wouldn't, though probably because she assumed they were natural. Still, it was a relief to know he wouldn't have to explain himself.

Sans gathered himself and tilted his head back to look at his favorite human. He could smell that she'd showered not too long ago, and see it in her damp hair. And as he stared at her, the statement clicked. She.... thought he was going to let her endanger herself over this? Fat chance. She had a better chance of him telling her to reset. How could she even begin to think that he'd allow this? Frisk really should know him better than that by now.

Sitting up, he kept his back to her and stared off at the various scars and burns left on the ground and snow. On top of what was to come, Sans wasn't comfortable training with her. Neither one of them had good hp, granted she could survive a hit or two, but the thought of accidentally hitting her, it was nauseating.

He only had 1hp, but he was still a very powerful monster.

"sorry, kiddo. i don't think that's such a good idea. maybe when there's not some psycho "sans-double" running around who wants to murder us all," he spoke lamely as he stood, still keeping his back to her. He knew that if given the chance, Frisk could most definitely convince him otherwise, but he knew the penalties of even one mistake in training, especially if it was just the two of them.

And if he did allow her to train with him, what would he do if he lost himself in a flashback? Would he even be able to do anything? It was rare now, but sometimes...... sometimes he swore he could see her as a child again, bloodlust in her eyes, and a dusty knife in hand.

He knew it wasn't real, that Frisk would never do such a thing again, but he was messed up from all of those resets, and his broken mind could conjure the image at random. And if it did that in the heat of a friendly bout of training, and he lost control, he'd never forgive himself. No, he wouldn't let it happen, plain and simple. Turning to her with an obviously fake grin he walked past her,"com'on, let's just go home and surprise Paps with some lunch or something."