A quick reminder about where everyone is before Falen attacks. I'm not sure if he meant to thow the dagger from his current spot or move and throw it. If the latter, Falen will have to make a Reflex save as well unless his movement is somehow more than 30 feet, plus the gargoyle golem will get an AoO against him if he move more than 25 ft.
If he throws it from his current position, the distance will be 30 feet to the golem. That would be a -4 penalty due to range increment. Since he only added +6 to his attack (instead of +10), I sense that is what @Aust Thale is doing and already took the -4 penalty for range increment.