MTG Salvation

Quote from Horseshoe_Hermit »

608.2. If the object that’s resolving is an instant spell, a sorcery spell, or an ability, its resolution may involve several steps. The steps described in rules 608.2a and 608.2b are followed first. The steps described in rules 608.2c–k are then followed as appropriate, in no specific order. The steps described in rule 608.2m and 608.2n are followed last.
[...]
608.2b If the spell or ability specifies targets, it checks whether the targets are still legal. A target that’s no longer in the zone it was in when it was targeted is illegal. Other changes to the game state may cause a target to no longer be legal; for example, its characteristics may have changed or an effect may have changed the text of the spell. If the source of an ability has left the zone it was in, its last known information is used during this process. If all its targets, for every instance of the word “target,” are now illegal, the spell or ability doesn’t resolve. It’s removed from the stack and, if it’s a spell, put into its owner’s graveyard. Otherwise, the spell or ability will resolve normally. Illegal targets, if any, won’t be affected by parts of a resolving spell’s effect for which they’re illegal. Other parts of the effect for which those targets are not illegal may still affect them. If the spell or ability creates any continuous effects that affect game rules (see rule 613.11), those effects don’t apply to illegal targets. If part of the effect requires information about an illegal target, it fails to determine any such information. Any part of the effect that requires that information won’t happen.

Emphasis added.

Quote from Horseshoe_Hermit »

The 2 damage dealt to Psi Blast's controller is dependent on the spell resolving, which it doesn't do if all of its only target becomes illegal. The spell fizzles.

Quote from pierrebai »

Also, super obviously, homeward path. Also super obviously a reference to the Maltese Falcon movie with Humphrey Bogart.