It is possible Bp.F was an infiltrator from the start, shortly before the 1988 consecrations, OR, that he thereafter lost the faith and fell to becoming a mole, OR that he was gullible, taken-in, and is now in so deep that the only way out is via death. IMO, the latter is the most likely. While we must join forces to fight against him as an enemy, we must also take seriously Our Lord's command to "Love your enemies: do good to them that hate you: and pray for them that persecute and calumniate you." St. Mt. 5:44