I learned this trick while questing in HellFire Peninsular, and why it occured to me i would never know. But probably because been a Alchemist plays alot into how my play style changes as a paladin. Alchemy backs up or buffer my weak spots as a paladin. I don't usually use my own pots if i don't need to, but will if i really have to. If i'm totally low on mana, i can make pots and use so i always have mana or health pots even though yes i can bubble and heal. But sometimes i have long bubble cooldown in a tough fight. But i found that been a Alchemist Paladin i can perform a nice new trick if you call it that.
I needed to make a pot real quick in middle of fight and i have alchemy potmaking always on side bar, so knows exactly where its at. I Devine Shield, and i made a pot while in bubble, drank it all before bubble was timed out. And back to fighting with the buff from the pot since i was out of the pot. The only trick to it is you must be aware where all your specific pot spells are in your book so not have to search long, a quick scroll a sec or two and make quick. If the pot is hot key to click on you can click it immediately to drink. Work like a charm. But it works only if your a alchemist i guess in been able to make buff pots.
I started thinking how can i apply this at other times or situations. I'm not sure of its usefullness though but it has its uses i think. One you must have the herbs to make the pot. I always do. I guess if your low on mana or need a major health pot or buff pot you think you need and your a Alchemist Paladin you can do that in middle of a fight and be back at it with a buff to continue fighting. Well its something new to learn.