Severus felt himself being lifted and as unnerving as that was, it was simultaneously relieving to be off of his own abused body and in the hands of Lily's spell. A rush of warmth overtook him and he started to feel drowsy, though not as much from the blood loss as the spell and the overall situation panning out to something a little more positive. Lily was here, he finally realised. Not that he hadn't already noticed who it was; it was merely starting to sink in as he was being levitated to the help he so desperately needed. He tried so hard to keep his eyes open through it all.
A bit of rustling about was heard from the other side of the door till Professor Slughorn opened the small viewing slot, about to ask who had the nerve to get him up at this hour — that is, until he saw what was going on and started spluttering, "Why — why, what's — who —" He pulled open the door and waved them in, quickly reaching for Severus's bloody robe. "Quickly Miss Evans, by the hearth!" He pointed toward the blazing flames as he rushed toward his potions store, having seen the large gash and knowing what to do.
His hands reached for the essence of dittany in his cabinets as well as a Wiggenweld potion to bring Severus back to full awareness. Rushing over to them, he made sure that the boy was lying flat on his back while he lifted his head and helped him take the potion. After a successful majority of it went down, he proceeded to murmur a healing spell followed by a few drops of the essence of dittany over the deep gash. It appeared that there had been other wounds, but they were healed. Slughorn turned to Lily with an impressed look and said proudly, "Very good work, Miss Evans! He shall recover nicely with a bit of rest."
Doing a once-over to make sure that all of the wounds were tended to, he touched Severus's forehead and noted the clamminess and perspiration. Standing up, he turned to Lily and took her slightly aside, speaking in a low and grave voice. "While I do not wish to pry, I would be very watchful of him if I were you. He does not appear to have been in his right mind."
Meanwhile, Severus was sucking in breath at the sizzling pain of the essence of dittany, but all in all, he was starting to feel better. Clearing sable eyes focused on the coppery colours of the flame beside him and he started breathing more easily.