As long as no damage has been taken the Wizard in seconds, they gain a shield that can absorb unsaved damage. This shield is refreshed as soon as the Wizard manages another seconds without taking any damage. The amount of damage absorbed equals of maximum Life.
"Power begets power. The excess energy from one spell is absorbed by the other, and so the effect is sustained." — Excerpt from Grand Master Clavaught's Lecture on Synergistic Effects in Esoteric Arcane Spheres.