If you are doing a "combo high punch" such as an elbow or whatever, start with a single low punch first before going into high punches. This forces it out of "combo mode" essentially and allows you to string together normal high punches. Other than that you just need to time it so that every punch is delayed "just enough" so that the opponent gets in a single frame of attack before the next punch hits.
I find the best way to learn this timing is to time each punch with the "ow" sound that the enemy makes from the last punch. If you get it right, you will get into a perfect rythm where your input presses synchronize with the enemies pain sounds.
Its definitely not as easy as it looks, and its very challenging to keep it up for the entire run without making any mistakes. Just remember, if your opponent stumbled back .. you were punching too fast. If he broke out of it and attacked you, you were punching too slow.
There is a very small chance for your opponent to break out of it with a throw regardless however, this is RNG. It actually happens more commonly on fight 1 and 2, seeing it in any fights beyond that is extremely rare but it does happen. Due to that though I recommend pushing to fight 3 and making a save state there to properly practice the technique.
Hope this helps! Good luck!
yes, There is a safe strat.
Begin the round walking back .. most of the time he will charge. If he charges across or charges into the air you will be out of range and you can uppercut him. If he fireballs and you are quick enough, you can teleport punch on him and then Spear. It's a little rarer to happen though, in general its better to play around the charge happening. You are just looking for 1 spear or uppercut to get the strat started.
Then: Run in close before he gets up and LP, LP, LP, Spear at point blank range > Uppercut > repeat.
The first 2-3 punches may or may not get blocked but either way when you go for the spear he will have been pushed to a distance in which he will 100% try to do a counter move but your spear will be faster than anything he can do and you will always hit. If he blocks the spear its because you didnt do enough punches to "push him back".
You should be able to use this to beat him pretty easily, and the strat is useable all the way down to around the 4:50 ish mark, so it will be a while until you need to resort to the harder strat in order to get a good PB.
is there a easy way to beat the endurance with 3 people that is the part i having a hard time with it