Explain to me the difference between Heal and Shield?

Example: Dependent on loss health, if someone hit you with 100 damage, and you shield for 50 of it, that means the damage taken is -50. But if you heal 50, would that heal still reflect like a shield and you'll technically still be recieving -50 damage?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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