Bolden and KBH had a good scrum and KBH came out unscratched (politically).
And can you imagine the outrage if KBH didn't? If Bolden attacked KBH the same way Congress attacked Bolden?
NASA can't "call out" Senators. That'd be political and attacked (rightly?) as a politicization of NASA.
That's why these hearings are ALWAYS fairly one-sided. No matter if it's Bolden, Griffin, etc.