Sometimes in survival when you beat a robot it falls and just teleports back up and falls again. If you have a robot that takes a bit for it to load the win stance this will happen. (It works best with Atom Gold)

I was playing real steel and I was versing ambush the first guy and I kept moving back and then I appeared in the audience and ambush couldn't kill me. I tried the glitch again but it no longer works.

When you run out of Energy Cores, you are unable to fight in any more battles until you have at least one of them regenerated. But if you don't feel like waiting to regenerate all of your Energy Cores, you can cheat and help the process along. All that you have to do is and go to the date and time settings on your phone or tablet and set the time forward. Half an hour should be enough to restore all of your energy.