How Can I Appropriately Use Another Creator's Video To Reply To?

A very popular content creator recently uploaded a video with MILLIONS of views showcasing an incredibly unsafe behavior that ties directly in with my channel niche. I am considering a reply video of sorts showing the unsafe behavior and talking about it at depth.

This video has the potential to bring a ton of new eyes to my small channel. I want to approach this tastefully, respectfully and safely for my channel. I don't want to straight up drag the other creator, but when a creator with 20mil subs is highlighting a super risky behavior that is very easy to duplicate at home, I think it should be addressed.

My questions are:

How much of this video can I safely use?

Are there any good resources I can further research this type of video?

Are there certain amounts of time I can allow a clip to play without pausing and it not cause issues?

TIYA for your help!