This is an often overlooked ability since no one wants to die. It is however a very powerful ability and one that should not be forgotten about. This ability allows you to select one member of the group and remove them from combat and place them in a bubble. It does so at the cost of Eve isk though!
This is an amazing little ability though as by removing another player that can rez people, you can prevent a group wipe. Just make sure you target the correct player and that they will be out or aggro range from the MOBs or Boss when they release from DI. Also make sure you always carry the reagent to cast this ability. While you dont want to die, you will be praised by your party members and resurrected right away. You prevent the whole group from having to run back from the graveyard.