Unfortunately I have no pics or movie, but this one is very easy to do. On halfus, pop the engineering speed boost a few seconds before he does his shadow fury AoE knock back attack, if the boots back fire, they will knock you straight up, and Halfus' attack will push you past the walls (just make sure you aren't parallel with the walls themselves).
---------- Post added at 10:32 AM ---------- Previous post was at 10:12 AM ----------
Oh yah, there's a good chance this may work with other bosses that have knockbacks.