Trumanator informs me that what I said about vine shields is wrong. Well, this is why we preface with IIRC
It's been so long since I've actually used them and had to know how they work that I'm not 100% sure of the mechanics. What I am sure of is that he has a very different idea of how they work than I do, and there have been wildly different theories on the exact mechanics in the past on the forums.