Battle
Why did Sam make a fierce fire like that?
That is, he is using the basic instincts of the beasts to his advantage. Any beast which isn't of a fire attribute is aversive to that and since, the beast bosses doesn't seem to be a higher level and can't control each and every beast to forcefully tackle the flame.
If not for the fact, Sam is confident in his speed to cut down the trees, he wouldn't think of the problem. Now, only the fire type beasts which aren't too many compared to whole horde of beasts are the only one's attacking them by jumping through the fire and they could deal with them.
They are only left with about twenty capsules of the corrosive liquid.
Since, he doesn't have any of the meat of myriad mirage chameleon it is impossible to create it more.
But still, they are in a better situation than others. The other teams didn't even have the opportunity to copy this as the beasts already reached them.