It would be a poor wall that didn't face both ways Sefariel thought to himself. Certainly, the devil could transport itself to the other side of the ice easily enough... but that would take time, and effort, and Sefariel was content to have it expend both. Bracing himself against the wave of cold that would follow, he maneuvered through the opening and placed as much ice between he and it as possible. That expediency completed, he began chanting an intense spell, seeking to summon forth an ally for the fight.

Spoiler: OOC
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Move through ice wall (I believe there's some damage to be had here, let me know in Discord

Start casting Summon Monster IV, to be completed with a move action next round