I think it depends on the situation, personally. I dont think he’d do it just because, but if Rump was needed beyond a doubt to save the EF from a time traveling witch or a whatever, ESPECIALLY if Henry and Emma were in life threatening danger, I think he’d do it.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC