As Volcano, when destroying your own Presence for "Explosive Eruption," can that Presence be saved (by, e.g., "Flowing and Silent Forms Dart By")?

As Volcano, when destroying your own Presence for "Explosive Eruption," can that Presence be saved (by, e.g., "Flowing and Silent Forms Dart By")?

Yes, but not usefully. It doesn't count towards the eruption threshold requirements / effects (because they check the # of Presence actually destroyed) or for "Collapse In a Blast of Lava and Steam" (because "destroy" gets replaced with "push" before the rule "when your Presence is destroyed, deal damage" kicks in).
Prior to the ruling that cancellation/replacement always happens before changes/additions, you could decide on the ordering, and apply damage from "Collapse In a Blast of Lava and Steam" before the "Flowing and Silent Forms Dart By" substitution. but this is no longer true.