Headscratchers / Adventurers!

In this strip, Karn explains Eternion how VCANCEL works, which would normally be a problem, however, we learned earlier that bosses and enemies pick their skills at random, then how exactly knowing how it works would help Eternion? if anything, it would add up to his frustration.
http://tvtropes.org/pmwiki/pmwiki.php/Headscratchers/ADVENTURERS