Sam is currently in the middle of the forest.
He is in a makeshift camp near a stream. He is currently fiddling with that large metallic ball. He is reinserting the spikes inside and filled the gas and bio-fuel along with the poison so that it can be used again.
He actually made this because the feathered are flying creatures and the rapid work of this ball with which it throws the spikes and set them ablaze is good enough to target them when they are in the air.
And all he has to do is kick with proper timing and position using fire element.
But that is not the only thing it can do. He can think of other ways to use it.
He started grilling a piece of meat as he prepared for lunch.
While he is eating, the wights and the ghouls returned to him along with a bunch of undead creatures.