After a period of research, Leon had roughly discovered some new techniques in using his Golems.
The Demon Alligator Hunter was an Advanced Apprentice level Golem; using it would occupy two points of his Spirit. Such occupancy would last as long as the Golem is still in use. Meanwhile, the Pseudo-Mage level Rock Snake would occupy three points of his Spirit. This also meant that if Leon go all out in battle, with his eleven points of Spirit (Circlet of Nobility gave him +1 in Spirit), he could only maintain one Demon Alligator Hunter and two Rock Snakes in the battlefield.
After all, he still needed to conserve some Spirit in order to cast necessary magic spells.