I reported this through the in-game bug reporter, but just wanted to post on forums as well in case it gets lost.
I was in the Divine Power mode and fired "Punishing Light," then decided to click "Soothing Light" immediately after. But I noticed as I held the "Soothing Light" button, "Punishing light" was actually attacking the enemy. I kept holding it down, and when my divine power was completely depleted, "Punishing Light" was still active and dealing damage. This went on for a few seconds until the enemy died, then my character went back to normal. I wasn't able to replicate this, but it may be something to look into.
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