Broken exhaust manifold bolts

I had one in a BB 906 head that snapped the easy out on extraction. Got cocky and What a pain that was. I usually step drill to almost thread and they come out fairly easily. That one I ended up knocking into the water passage and it came out through one of freeze plug holes. Had to put a heli coil in that one with lots of thread locker. Re chased afterwards and all good.