Seems to be within the level 30-40 range that a bug crops up with evade combat. It's basically impossible to avoid. Turn on your evade shield, when on block, if your opponent tries to hit your evade it takes up to 4-5 hits before it's taken down on grab tactis.
In a standard 50v50 combat, it should take no more than 2-3 hits on grab to expose someones shield. However, as you can see, it takes 4.

System logs:

However, with speed tactics it takes the standard amount of time that it should.
