As soon as Alex was done killing all eight of the mutated spider monkeys he quickly gathered their core a sat down in a cross-legged position in preparation to absorb them. Since he didn't bring a backpack he didn't have a place to store the fist size gemstones so he decided to use them right away.
By the way, this is just a yellow zone territory so there is no need to worry since all he can run into are wolf threat mutant beasts. Holding two gemstones in his hands Alex began casting the Mater absorption ability and slowly he could feel the powerful suction force, pulling the energy within the beast cores. His eyes lit up with power as his hair fluttered in the wind while he did that.