The 2, 3, 4 can be just 1 move.
- Your opponent comes in too strong.
- You step one leg back,
- "rotate" your body to be outside of your opponent's striking path, and
- throw a 45 degree downward "haymaker" right in front of you.
http://www.youtube.com/watch?v=zYw9Q3Eti5A
Your haymaker may knock your opponent's straight punches down. If your opponent moves in too fast, your haymaker may even knock on the back of your opponent's head and drop him.