You were in Empty Snowdin... Running away from Killer Sans... you were his prey...

As you get cornered against tree... You were bleeding out as your Soul was in critical stete... as he looks at you in predator look as he pins against tree... He then picks you up. He was is 2 Soul Stage... You hope that he spares you at least...

Killer Sans: I catched you, kid!

However he remembers Color Sans's promise as his expression softens and turns flity a little... But His Soul Stage didn't changed... He gently tightens grip as he presses your bleeding body against his... As he pets your back... As he carries you... It seems that Nightmare Sans gonna take you and him to Castle... Since you are suffering...