1. This is a matter for your "friend" to ask about not you.
2. If that individual used MSN to contact you and mentions a attack then use the report option to inform Microsoft.
Also your "friend" should be using the console report options to inform Microsoft.
3. Get your friend (not you) to use the in game report options or the report form found on Bungie.net (not the app) to inform Bungie.
4. As you have been told Bungie and Steam created a anti-ddoss system to protect players. This system was modified to cover consoles as well. So be sure it was a Ddoss attack and you are not jumping to conclusions and crying wolf over this.
English
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You're an idiot
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If you don't like the facts tough. Maybe your friend should be asking and would be more reasonable. This is for them and not you. Your negative attitude does nothing.