Bland slips up when he states it is to  enable him to proceed on his path to the murder of Duncan. 
( Bland ( ( ( slips up ) ( when ( he ( states ( it ( is ( to ( enable ( him ( to ( ( proceed ( on ( his path ) ) ) ( to ( ( the murder ) ( of Duncan ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Bland)) (VP (VBZ slips) (PRT (RP up)) (SBAR (WHADVP (WRB when)) (S (NP (PRP he)) (VP (VBZ states) (SBAR (S (NP (PRP it)) (VP (VBZ is) (S (VP (TO to) (VP (VB enable) (S (NP (PRP him)) (VP (TO to) (VP (VB proceed) (PP (IN on) (NP (PRP$ his) (NN path))) (PP (TO to) (NP (NP (DT the) (NN murder)) (PP (IN of) (NP (NNP Duncan)))))))))))))))))) (. .)))
Bland deftly avoids any discussion of his path to the murder of Duncan.
( ( Bland deftly ) ( ( ( avoids ( ( any discussion ) ( of ( his path ) ) ) ) ( to ( ( the murder ) ( of Duncan ) ) ) ) . ) )
(ROOT (S (NP (NNP Bland) (NNP deftly)) (VP (VBZ avoids) (NP (NP (DT any) (NN discussion)) (PP (IN of) (NP (PRP$ his) (NN path)))) (PP (TO to) (NP (NP (DT the) (NN murder)) (PP (IN of) (NP (NNP Duncan)))))) (. .)))