FocusFireAttention! Butt missiles. That is all.
BombOmOmI always wondered why this was not a thing, particularly when short-range heat-seakers were the best missiles on order.
Semi-Hemi-DemigodConsidering it's a SeaMaster they might be anti-ship missiles
FaceDeerWell that seems unlikely, what are the odds that an airplane is going to be chased by a ship?
It's a fake out. The boat sees it flying away and stands down then BOOM.
(Also, since it's a flying boat I don't know how they'd have an internal bay without a lot of water infiltration.)