I would love to see a “Watch Cinematic” button in the synopsis of each mission in the “My Story” tab on the “Hero” page. There have been times where I was distracted from or couldn’t hear the cinematic (like when someone is talking close by or on Skype, Ventrilo, Teamspeak, etc.) or at least part of the cinematic and wish I could rewatch it. Of course, with missions that have more than one cinematic, there would have to be more than one button or maybe just separate them with visual and auditory cues.
Another option would be to replay the mission (that would also be a good idea), which I saw someone mention somewhere else (but I can’t find the post again).
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