I'm currently running Out of the Abyss, and my group is about to encounter a mage with a description that says
If the characters become hostile, [the mage] orders them to depart, lest they provoke the wrath of his all-powerful master. If attacked, he uses his globe of invulnerability scroll, casts fly on himself, and flies into the chasm.
Both spells are concentration spells so I'm not sure if this is an error in the module, if you don't need concentration for scrolls, or if I read the paragraph wrong and he just uses the scroll first, runs away, and then proceeds to cast fly and fly away.
So my question is: Do I need to hold concentration for concentration spells cast with a spell scroll?