who , exactly , is fighting whom here ? 
(ROOT (SBARQ (WHNP (WP who)) (, ,) (ADVP (RB exactly)) (, ,) (VP (VBZ is) (VP (VBG fighting) (NP (WP whom)) (ADVP (RB here)))) (. ?)))
(ROOT (SBARQ (WHNP (WP )) (, ) (ADVP (RB )) (, ) (VP (VBZ ) (VP (VBG ) (NP (WP )) (ADVP (RB )))) (. )))