The hole was plugged by the Water Shield, yet there were still abominations crashing down on it. The Water Shield was capable of repelling both physical and energy attacks, but, if one were to simply reach into the spell slowly, one could actually pass through it. However, the abominations would have had to pay a huge price for doing so.
The three-layered Water Shield was actually hardly higher than a one-layered Water Shield in terms of defense. The additional layers required careful calculations to avoid adversely affecting each other. Saleen cast the spell after doing some rough calculations. The key to using such a spell correctly relied on lightning patterns, restorative water, and magic liquid to damage abominations.