What do we know.....? Partner didn't overcall 2C (although it isn't clear what a 2D o/c could be, I would had take it as a take out double). Partner didn't Double 2C. We also know (, at least after 3D we are 100% positive) partner didn't have any shape problems whatsoever that could prevent him from Double (or o/c 2D for that matter). So, I gather partner is just trying to compete with second round double. With this assumption, I Pass. Double doesn't strike me clearly as penalty and even if it would, I am far from counting 5 tricks on defense. 3H is also possible, but I fear this can be too high and I absolutely dislike the fact of 50% of my hand being in Diams. (which also recomends we defend, right?).