loses. loses his hand.
to be deprived of or cease to have or retain (something).

the seal is loose. "look at it go, it's on the loose!"

set free; release. "the hounds have been loosed"

here, he loses his hand to the loose seal.

super nit pick sorry, I can't identify why but this homophonic and confusing mistake/typo seems to be growing for some reason, but it sticks out often. english is irritating.