You should not be able to cancel shambler's devour by just grabbing it

[Angel]

Now I know this is a debate that has happened several times, several threads talking about it, but I want to bring it up again, I am personally part of the group that thinks grabbing shamblers is funny, but one thing that could be done to balance it, is making shambler ungrab-able by the person who they're devouring, or if that's too hard/impossible to do, maybe ungrab-able mid devour? The logic being that while it's devouring someone, it opens a monster like mouth that eats the person, making it impossible to grab them.