In actuality, Lawrend's understanding of the Theory of General Relativity wasn't in-depth. He was bound to stop using it at some point.
Everything happened in a split moment. Ember was still screaming, but Lawrend was already done unwrapping Alexis' gravity spell.
Lawrend controlled the space around Ember. He did it in a way that suddenly loosened the curvature of space. His space magic was still at the True Mage level, but because it was the magic of space, it was capable of exerting finer control over space.
Unlike Alexis' Earth Mage spell, Lawrend's spell directly acted upon space. It was more efficient and effective.
It was similar to someone moving a boat using wind sails. It would always lose to someone using a powerful motor that could directly push the boat.
A surprised look appeared on Ember's face as she turned her head to Lawrend. She suddenly felt the gravity around her disappear. She felt weightless and confused.