"Jim... you spoke while you were affected by the memory. You called me Tommy." Hunter tells him. "And when you said something about needing to get more water, you moved slightly off the couch... right before the memory ended."

Hermione studies the runes again. "This is why this dark spell is so deadly. He would have been trapped reliving those memories, physically and mentally. When you have a flashback, you will physically react to those memories."