It's no wonder Frodo changed so quickly, the moment he lost his power, his mind nearly collapsed.
The more fanatical he was before, the more terrified he became now.
He didn't want to go to Hell, and if what Allen said was true, wouldn't he be extremely sinful?
Just as Frodo was about to seek Allen's help, his father Lorencos appeared. This paladin, with his hair graying, didn't say a word, didn't even comfort his emotionally devastated son, but drew his long sword directly at Allen.
The fight was much duller than imagined, with both legendary holy warriors merely letting their swords be coated with a faint Holy Light before beginning a pure martial skills competition.
Though both could summon towering pillars of Holy Light, they instead chose to conserve their strength.
Even so, their battle still left Frodo dizzy. He now realized, that even if he still had his strength, he wouldn't last two seconds against Allen, the gap was just too large.