When I use alt space buffer,I freeze the game at the third soul flash,but sometimes I can get the skip,sometimes not.I wonder,is this is normal in the Mad Dummy Skip？

Yes it’s normal because mad dummy skip is a 1 frame trick so you have to be precise here’s a guide that can help also if you can’t get it constantly you could use another method such as an audio cue or flowtimer which can also be used

Thanks！

Your welcome hope this helps