Can someone explain how does Mr.Fantastic bypass Limber and

extend the stun timer making it last over 5-6 seconds? I saw KT1s Mr.F stream and he had Full F4 + extra Mr.F but I still dont get how exactly (or what buffs and exact interactions) cause him to extend the stun timer.
Thanks in advance
Thanks in advance
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Also, 2 disagree for what lol? Its recorded fact and not opinion/rumor/theory.