Step 1: Keep Enraged Defenses the way it is, and add a line saying "Also immediatly fills your resolve bar".
Step 2: Make Intervene a "Heroic Leap" like mechanic that gives its defensive buff to everyone in a small AoE around where you land. Make it on a 1 minute CD, the CD being reduced by 6 seconds per targets hit. This lets you use it as a group defe sive CD or an escape.
Step 3: Keep the reflect mechanic the way it is, but make it reflect effects too (such as DoTs, slows, etc. Stuns might be a bit OP).
Step 4: Enjoy.