A recent discovery:
That red flame in a Delsaber's claw is, evidently, what powers its invincibility shield, and it extracts that flame by slapping people... Don't let it slap you and it won't be able to use the shield.
Of course, they most likely start out with a flame, but it gets smaller each time they use the shield.
Another reason not to let a Delsaber slap you:
They pick their nose and slap you with their boogers... -_-
...at least, that's what it looks like.
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