Sidney showed up to testify with emails in hand .... emails that the State Department did NOT have because (gee willikers!) they had not gotten them from Hilly! This is how the committee found out about her private email/server arrangement. Blumie is making sure that he’s not going to get nailed with obstruction of justice.
So Sidney is just covering his own @ss at the expense of Hillary’s “”credibility””. Gotta love it.