He also adds that "Perhaps Juanšer had baulked at the thought of sharing responsibility for killing the senior Christian ruler appointed by God to manage earthly affairs. More probably he simply knew too much about the conspiracy against Constans. Whatever the reason, it seems likely that he had forfeited the trust of the caliph and paid for it with his life."
It is also possible that "Perhaps Juanšer had been reluctant to accept the burden of killing the senior Christian ruler appointed by God to oversee earthly matters. More probably he simply possessed knowledge that could have exposed the conspiracy against Constans. Regardless of the reason, it seems probable that he had broken the caliph's trust and ultimately paid the price with his life."