Take up grappling. Some maybe the next time he rushes you, wrestling systems, judo, aikido and all those will help to take him down. Or use that energy against him. Or move out of the way 45 degrees from his rush and deliver as much strikes as possible from there. Do not do this either early or too late. Too soon, he will detect your intention, change direction and rush you still.

The best is to move to his blindspots. E.g not infront of his face, to his sides, his back, shoulder. Lower body e.g. legs only if he's not Thai Boxer or a good kicker.

Or you could incooperate Aikido principles. Instead of resisting him, you use that rushing velocity, create your own force. i.e. pull him towards you. From there move to his back and throw as many strikes as you want.

When all of those just need more training, or if he's too fast. Put obstacles with your limbs. E.g. an arm in front of you, repeatedly front kick him back. Stop him from getting any closer. This is not as good as above tactics sheerly because you are still in his attacking arch. However, you wouldn't have as much of a risk of him using close quarter strikes. It gives you attacking powers as he is attacking you, though it reveals more opening and if his attacks are quicker and more powerful, this is not ideal.

Alternate method if you're not allowed to butt or throw.......get so close to him so he can't strike at all. Though it won't make the ref pleased.

Intro. Don't feel bad for not knowing what to do. I've been doing Muay Thai for quite a bit, and after years of practice, you gain reflexes you see in the movies. Haha. I wouldn't worry about it that much. Just practice defense and striking, and I think you'll be just fine.

keep your arms high in guard,anything he punches like that is extremy weak and if you keep you hands up he will just keep hitting your arms ...that will hurt him more than you. after you block a punch you go in for a jab if jab lands you do hook and it is over... but yeh,arms up high and you shouldn't block too many punches tho.. block once,twice and than burst into jab and he will be sitting on his *** with broken nose

Keep a shovel hidden behind your back until the last second,,,, then wack him

Side step.

I'm currently taking intro to sport fighting and there is this one guy there when you hit him good once he just bum rushes you and swings, all I can do is run till he gets tired but I look like a pansy doing that I just don't know what to do to stop him.