As of Slade's new book, his HF appears to have taken a serious jump, he was walking around (granted barely) with the back of his head totally blown out. Where as before he'd be done if he took a bullet to the chest.
With his increased HF, he'd at least be able to last with Bane, in a head on fight. But if Bane got his hands on Sladr, it would probably not end well.