Jamieson, Fausset and Brown on Isaiah 25:11

11. he--Jehovah shall spread His hands to strike the foe on this side and on that, with as little effort as a swimmer spreads forth his arms to cleave a passage through the water [Calvin]. (Zec 5:3). Lowth takes "he" as Moab, who, in danger of sinking, shall strain every nerve to save himself; but Jehovah (and "he") shall cause him to sink ("bring down the pride" of Moab, Is 16:6).

with the spoils of ... hands--literally, "the craftily acquired spoils" of his (Moab's) hands [Barnes]. Moab's pride, as well as the sudden gripe of his hands (namely, whereby he tries to save himself from drowning) [Lowth]. "Together with the joints of his hands," that is, though Moab struggle against Jehovah hand and foot [Maurer].