Obviously not the best footage to make a proper judgement but it doesn’t look like it hits Henderson at all to me.
The reaction of our players says a lot as well.
Surely there’s no way the referee can say for sure if it’s hit an arm and if so, whose arm it’s hit from the angle he is at. If it’s true he didn’t consult with the assistant on that side it just makes it even more bizarre that he’s given the penalty.
All of that said, we know what to expect from the officials in this league now and if you take care of the things we can control (i.e. not giving goals away every week) then we should have enough to overcome these crap calls.