"Every battlefield I've ever walked in has been littered with them." Occasionally he could ignore them but occasionally not. "It troubled Ahsoka when she was young. She was young enough to not have experienced it before and I didn't think to prepare her." His fault. His failure.

"Not all Force Sensitivities are a strongly attuned of course but we can all sense them, eventually." It was why the dead were normally burned - and how he made Jedi traps. Used the bodies and the souls connected to them.