Ive no idea if I'm correct here, but with AQs, on the button, I'm 3betting here to get rid of someone and build a pot. I'd reraise to 70, prob end up HU, and then be aggro from there in.

As plyed, CO could have just about anything pre. He has pretty much called half the cards dealt to him so far, how has he played from flop onwards previously? I guess that makes a big difference to his range.

As played, with no post flop data, I call the river bet.