Let's run the numbers:
Both are combat types so we'll give them both Con 14. As a 14th level fighter with Con 14, Roy has an average of 109 HP. As a 14th level Ranger / Barb 1, Belkar has an average of 103 HP, or 133 HP when raging. Both have Dex 13+ so we'll give them Dex 14 each for +2 to AC, though Belkar takes a -4 AC penalty.
Roy has a BAB of +14/+9/+4. Add +1 for Weapon Focus and +7 for Strength 24 and you end up with +22/+17/+12. Roy does a base of +9 damage (+7 Str, +2 Specialisation). Roy in the practice arena is AC 12.
Belkar has only one weapon so has a BAB of +16/+11/+6/+1, and a +2 or +3 Strength bonus. We'll give him +3. So you end up with +19/+14/+9/+4. Belkar gets a max of +6 favoured Enemy bonus damage. Belkar does d4 +9 damage with his dagger, +11 when raging. Belkar in the practice arena is AC 12 or AC 8 if he's raging.
Roy can afford to put 11 points of BAB into Power attack for +22 damage and his first attack will still hit. Roy does 38 damage, so it looks like Roy got a critical hit which forced a massive (non-lethal) damage save which Belkar failed.
And Roy is definitely phased by Bloodfeast. Assuming Bloodfeast is a SRD T Rex it has 180 HP and is only AC 14 so Roy can devote +10 to Power Attack for +20 damage or 36 HP a hit. I'm assuming Roy does a partial attack each time, not a full attack. Bloodfeast lasts 5 rounds.
I'm not sure what sort of armour Roy is wearing in #782 but I'm reminded of Warduke's Ceremonial armour and say it's Ceremonial half-plate granting a +3 armour bonus. It doesn't really matter as Bloodfeast has +20 to hit so will always hit Roy's AC.
Bloodfeast does an average of 24 HP damage per attack. Roy lasts 5 rounds. Who wins in round 5 depends upon who gets initiative. Note that 2 extra CON (highly likely) would see him through.
If Bloodfeast successfully grapples Roy, then Roy is in big trouble, not least because he only has a 2H sword.