But if it was that much then he probably couldn’t have caught the Carnivorous beast.-> ?? hard to understand

Then sword which was dispelled of the cutting magic couldn’t penetrate through his physical resistances. -> THE sword

Give it flesh to break its bones. -> Sacrifice flesh to break the opponent's bones?

He had to use as much as he could. -> He had to use people as much as he could.

He had settled around half -> He had beaten about half of them

Which meant this guy won’t be needed anymore. -> Which meant this item won't be needed anymore

at the 15 people who was  -> were

But his defense, ability to control his body and battle perception was -> were

A battle tactic -> fighting style, battle style

then you would the instant you stand in front of him. -> die? lose?

‘They probably felt like their necks had been flown off’ -> heads had flown off (a neck can't fly)

pearls on a pig’s neck-> would be wasted  (don't know the proper english expression)

She probably won’t be able to  -> wouldn't

 so if you have a objection -> an objection / objections

But no one thought of such thoughts. -> had such thoughts

The blade will come flying at them instantaneous -> instantaneously

 but what could he do with just this much. -> ?? don't understand