It is funny, this is actually one of the holdings that worried me a lot, but I discarded it as unlikely :). Let's say I pull to 2S. LHO has to make a 2-level penalty double with his trumps in front of the strong hand while his partner has promised nothing more than an 11-count with 3 hearts. Sure, he might hit this, but I'd say it's sort of unlikely. Now it comes back to RHO, and while I bet he has extras, he can't really double for penalty without any trumps and partner having promised little more than ♠Kxx. He has to either pass or take us off the hook by bidding. He might even not have extras, in which case he has an obvious pass.