If you finish the last mob right before it uses its overdrive, then paralysis and charm will be gone at the start of the second stage. If. If those are a serious obstacle to clearing stage 1, then you're undergeared. The main issue is that you don't want to Burst with either of those status effects active, and if you don't Burst immediately then the slime will cast its blind, and then stage 2 can potentially turn into a mess.