User blog comment:Neppudere/NepNep's "Skill Standby" Testing, Explanation, and Verdict/@comment-108.46.51.232-20150912165252

I don't think anyone's mentioned it yet but the green standby icon also seems to apply to servants now. I've seen it appear sometimes in the corner of servant cards in both FAW fights and EH. In those cases, it appears to nullify the next time you try to use an attacking skill. So, you can now tell when it'll block a crit or aoe.