It seems to be a belief among more than a few pilots that an RA requires an extremely aggressive action to avoid a collision. It does not. If you get an RA to descend like this pilot did, do a basically normal although purposeful descent placing the VSI needle in the range where you are being directed to do so. It is a 1/4 g manouver. In other words if you were at 1g like normal, the manouver for descent will initially have you at 3/4g. People should not be floating in air.