StarWaves
Plot hole: If you open a portal at the bottom of the ocean, the sheer pressure it'll shoot will disintegrate many things much else humans. A waterjet that are used to cut metals have around 30,000 psi to 90,000 psi. At the bottom of the ocean, there is 15,000 psi spread out. By spread out, it means just by being there, you'll be crushed by 15,000 psi equally. Imagine if all that pressure is concentrated in one human sized hole. The burrow should've disintegrated by that point.
Oh, like the Gate of Babylon?Probably, but it's farfetch since she didn't even realize the output would be as strong as she was expecting.There's a way to plug the plot hole though, it could be because of the protego diabolica that most of the pressure was gone and only the leftover water would be left.But there's still a plot hole from that. The steam created from the clash would easily burn someone's flesh off their bones. So technically, everyone except layla should be dead through melted flesh.
P_J_Sch:I should have elaborated further, I meant that it limits the out Put from the Water(meaning Speed and amount) based on Laylas Intent