[ The dead have been all around them in one form or another since they arrived in Yancai, certainly, but the pull of death specifically now tells him they're closer than they've ever been to hopefully ascertaining the source of the time loops. How they've done it.
Thankful that she silently allows him to lead, the Doctor's abilities certainly aid them as they follow. Able to see a great distance ahead, they can trail significantly behind the witches and remain unseen while still not losing sight of them entirely. He can also hear the vibrations of other creatures around them, so as they swim and seem to near the end of a passageway, the Doctor suddenly reaches his hand back to halt her. They linger there, with the Doctor not daring to move yet. At last, nearly thirty seconds pass before the cause of his sudden stop reveals itself when a large shadow passes by; they've avoided one treacherous looking fish, though he's thrilled at being able to see it from here. He twists a bit, carefully, and presses and flattens his body up against the side of the tunnel, so Vanessa can see it as it passes by, a grin on his face for a moment. ]
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[ The dead have been all around them in one form or another since they arrived in Yancai, certainly, but the pull of death specifically now tells him they're closer than they've ever been to hopefully ascertaining the source of the time loops. How they've done it.
Thankful that she silently allows him to lead, the Doctor's abilities certainly aid them as they follow. Able to see a great distance ahead, they can trail significantly behind the witches and remain unseen while still not losing sight of them entirely. He can also hear the vibrations of other creatures around them, so as they swim and seem to near the end of a passageway, the Doctor suddenly reaches his hand back to halt her. They linger there, with the Doctor not daring to move yet. At last, nearly thirty seconds pass before the cause of his sudden stop reveals itself when a large shadow passes by; they've avoided one treacherous looking fish, though he's thrilled at being able to see it from here. He twists a bit, carefully, and presses and flattens his body up against the side of the tunnel, so Vanessa can see it as it passes by, a grin on his face for a moment. ]