I was reading the question as can you dump directly from the HST, i.e. is it selectable.
Strictly speaking as NSEU states the fuel from the HST doesn't go to the CTR tank it connects directly to the refuel/jettison manifold.
However you can't directly dump just the HST which is how I saw the question, I was wrong in saying that it goes to the CTR tank, normal fuel transfer from the HST would however in this scenario it wouldn't. Hope that helps.
