Ah, sorry [@Hekazu], I guess I wasn't too clear on what happened.

I had Orchid use a grapple as his Attack of Opprotunity, which I was fairly certain would succeed with a 23. 

Then it was my turn, so I used my standard action to shove, which I'm pretty sure I failed at with a 7, but who knows maybe the baddy rolls a 1 or 2.

Move action, I pulled out my shortsword.

I did my Attack of Opportunity and my turn in the same post, if that makes any sense.

Edit: Also when you mentioned this bit, 

[quote=@Hekazu]
<Snipped quote by Lucius Cypher>
Opportunity Attack is not an Attack action, due to its nature as a reaction. It is but [u]a single[/u] melee attack, which is why Extra Attack does not function with it either. However, I think this is one of those times when we can consider this needless bickering and allow a grapple attempt to be made. It makes perfect sense for one to be able to try it, so go on ahead with that if you want.
[/quote]

I assumed you meant I could grapple as an AoP, which really helps my action economy to allow me to Grapple into Shove.