He glanced back over his shoulder. “Wouldn’t you agree, Shadowsight?”
Shadowsight’s jaw dropped, and he stood gaping, utterly astonished. The false Bramblestar was staring straight at him. Panic surged through him, and it took all his courage not to flee back to his body in the SkyClan camp.
The ThunderClan leader bared his teeth in a grin. “That’s right . . . I can see  you,”  he  meowed.  “I  knew  you  were
 trespassing  in  our  territory  the minute you appeared in the camp.”
Shadowsight struggled to find words. “But how?” he asked eventually.
Bramblestar shrugged. “Maybe it’s because I’ve been to StarClan and come back more powerful than you can imagine. Maybe it’s because I have a connection to those I’ve killed.”
Shadowsight let out a gasp. He’s confessed! He’s the one who attacked me!
“Or maybe,” Bramblestar continued, his face still set in the same chilling grin, “it’s because spirits can always recognize other spirits.”

Veil of Shadows, Chapter 13