The only movement you can do while casting is direct left and right turn.
Something to be careful for is stopping after running. You don't stop moving the instant you release the forward key, there is a little delay before you stop moving. If you cast at this time it will interrupt.
Underwater is even worse. You can sink and cast just fine, but you just have to make sure there is absolutely no forward or backward direction and its even tougher underwater.
Give yourself a split second to make sure you're completely still if you're running around taking care of mobs and you'll see a big improvement.
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