Simple RAW for 5e V: The Disadvantage Strikes Back

[Asisreo1]

Q44a

Does having immunity to the damage of a spell or effect also negate that spell or effect's riders? For example, if a bard casts Dissonant Whispers on a Stone Golem. The golem is immune to the psychic damage, but does it still make a save to negate the "move as far away" rider?

Q44b
Does compelled moment trigger opportunity attacks? Taking Dissonant Whispers again, if a creatures fails their save and must move while in melee range of a PC, does he provoke the OA? It uses a "reaction" to move, not a move action. It's weird.

A44a
Unless the Rider specifically says the rider only happens due to the damage, the rider is separate. So they would need to make a new save.