Missing scene from Powers of Evil.
"The path moves left here, Mr. Holmes – watch that edge," Lestrade called.
We staggered along for a minute or two in silence. Then Watson's grip round my shoulders started to slip, his knees buckling under him, and he gave a faint gasp, his eyes fluttering closed.
He was still shivering violently under my coat, and I hastily caught him as he stumbled, falling heavily into my arms.
"Easy, old chap. On your feet," I said gently.
"S-so c-cold," he said faintly, trembling in my arms.
"We're nearly out, Watson, just hang on for a bit longer."
"C-can't," he whispered feebly, shivering.
"Yes, you can," I soothed, glancing up at Lestrade's worried eyes above the lantern, "I'm right here. Now come on, old fellow, move your feet. That's it."
He obediently stumbled along, making it a few yards before his legs buckled again. I took his weight while he struggled to get his feet under him, his whole frame shaking with weakness.
"I-I'm s-sorry," I heard his faint whisper and felt my eyes sting.
"It's all right, Watson."
"But I–I'm being such a b-burden, if only I –"
"Shhh, now stop it – this is Stapleton's fault, not any of yours," I said, my voice tight.
"B-but –"
"And besides, Watson," I went on, more softly, "you will never be a burden."