It looks like it was fixed today. Tested it on 2 healers a minute ago and it looks like our spell lock when using Grimoire of Sacrifice actually locks them out of their school of magic, on casts rather than only channels. Anyone else test this today? Previously, it only silenced on any cast other than a channel.
I have to test it more. The first time I spell locked it kind of was. Other times it wasn't. I think it's very similar to using the pet spell lock now, because that one is also laggy, from both the upgraded version and the normal version. There's still work to be done with our spell lock