From his previous experiences, he knew that he'd get more experience and better odds of getting LifeSkills and Genuses if he participated in the death of a creature. It was better if he killed or assisted in a kill than simply reap the death of a creature without doing anything.
And this Canzer was no simple creature. It was a monster that was probably realms higher than the Student Realm, judging alone from the fact that Yasmine couldn't even burn its fur. Not only that, the Saviors that came in to rescue them were exuding strength that Atlan couldn't even fathom.
Reaping the death of this creature would surely bring untold rewards to Atlan.
But wouldn't it be better if he got more? If he could make it bleed a single drop, he guessed that his rewards would increase even more. The only problem with this was how he would do it.