Survival Instinct

You know how to get yourself out of danger and put your friends into it - in a good way.  You gain the following benefits:

• You gain proficiency in your choice of Dexterity or Constitution saving throws.
• As a reaction to being targeted by an attack, you can choose a willing non-hostile creature within 5 feet of you.  You and that creature change places and the chosen creature becomes the target of that attack.
• You benefit from cover from allied creatures up to one size smaller than you.  When an allied creature provides cover for you, they provide three-quarters cover instead of half-cover.