Using content from another YouTube channel

I've been inspired by a video made by Think Media but Ali Abdaal is the person giving the advice. I'd like to use some of his footage as B Roll in my video for this challenge. I know I should try to ask permission.

1) Do I ask Think Media or Ali Abdaal?

2) If I don't get a reply from either, can I use any of the footage? There's a few clips that I could use. If I remember correctly, none of them are any longer than 15 seconds. Are they short enough where I wouldn't get penalized by YouTube?

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