Lol this thread can become something beautiful. Just gonna share my experiences just to show that everyone makes mistakes and there's nothing you can do. So I get in a dungeon with light party in DF. Apparently, their DPS was so slow (with mine combined) that I honestly felt the need to forget about healing all along. Well, after each encounter I started seeing that my heals weren't doing much so I'm like "oh well, something's off...oh well." Derp derp, I was healing in Cleric stance due to tunnel vision trying to DPS. Led to one of the most beautiful wipes ever as I tried to get a benediction off but tank died 0.2 seconds before it went off. They cursed at me from A-Z but I still laughed it off. You said you wanted to learn how to prevent things like that, sometimes...you can't and that's the beauty of healing in an MMO.