Flop:
When I open from EP is check/call ever a good line?

Turn: We both totally look like we're full of it. Consider the hands he could have:
o A monster he checked behind. (we get his money always because we turned an even bigger monster.)
o Air because my line is total shit, but he can't take any heat so at best I get a river stab out of him.
o Some draw he picked up and will often bet the river either as a bluff or for value if he hits.
o Something with showdown value he's raising now for value indending on checking the river behind.

I think the last is the vast minority of his range.