Please clarify combat invisibility adjudication

@GWJRabbit @ChrisPerkinsDnDGroup has one plea to @mikemearls and @ChrisPerkinsDnD – please clarify combat invisibility adjudication. Actually just my DM. We’re good!
it's easier than it looks – you can hide when people can't see you. invis = can't be seen = hide when you want

— Mike Mearls (@mikemearls) October 10, 2015