Bait and Switch

When you're within 5 feet of a creature on your
turn, you can expend one superiority die and
switch places with that creature, provided you
spend at least 5 feet of movement and the creature
is willing and isn't incapacitated. This movement
doesn't provoke opportunity attacks.
Roll the superiority die. Until the start of your
next turn, you or the other creature (your choice)
gains a bonus to AC equal to the number rolled.