Sean "Diddy" Combs.
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- A newly leaked video appears to show Sean "Diddy" Combs assaulting Cassie Ventura in 2016.
- An attorney says Combs' subsequent apology won't mitigate any legal consequences.
- The video could help Combs' other accusers bolster their own civil cases against the music mogul.
A "smoking gun" video of Sean "Diddy" Combs could help plaintiffs in other civil suits against him bolster their cases, an entertainment lawyer told Business Insider.