Well from my experience messing around with shoulder charge you can't double charge unless there is some extreme lag
Or you can twilight dodge and you have a half second window to actually activate shoulder charge
[spoiler]which trust me is extremely hard to do but is possible [/spoiler]
That's all I have for explanation I hope the answer you seek is in these notes
English
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I thought Twilight immediately got rid of the SC window?
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No I did it be accident when I was messing around on my Titan You have to have super precise timing to pull it off so I doubt I can do it again