Even though he didn't want to use any skills or abilities that would disappear once the system were to stop working, Shane couldn't help but think that there was no other way out of the current predicament.
The situation was just too dangerous for him to neglect abilities like his 'Berserk Hunter' title's [Berserk] skill in addition to the Mask of the Curse Susurro's ability [Artemis' dome] that could protect him from all kinds of dangers as long as he supplied it with enough mana.
Shane was not sure whether or not the skills related to Artemis' blessing would disappear with the system, but he could assume so.
He had yet to figure out how he could sense anything about the blessing within him even with the system's guidance, let alone without, after all.
As such, he decided to not use anything involving Artemis' blessing except the passive abilities that were activated upon meeting certain requirements.