Rushing the phone seems ill-advised on pretty much all counts (a few exceptions come to mind, but they're mostly reaching)... they're already set to practically torture him to death, if not directly, then by blood loss or infection. I'd take my chances with the Japanese courts, despite their infamously high conviction rates. And if he is actually involved, he looks even guiltier now; it wouldn't be out of place for a pack of panicked despairing people to just beat him to death in a fit for crunching their lifeline.