One of the challenges of the "New World" Mission is to carry a knocked crew member over a distance of 10m. Since the arrival of Chapter 2, it has been possible to carry an ally who has fallen to safety. This feature is instantaneous, so you can get your friend to safety before the enemy attacks you.
When you are next to your fallen ally, simply press F. You will then put your partner on your back. Run a distance of 10m or more to complete this challenge. Be careful and don't press E — which remains for slow resuscitation.
It is advisable to do these challenges in Team Rumble. You can easily throw a duo game, and you will have less chance of being attacked by enemies.