What happens here is that one of the two stresses becomes subordinate to
the other, the stress being wholly assumed by the more dominant of the
two.
Where three or more vowels unite in a synalepha, two things must be
borne in mind: (1) Stress-shift is not harsh to the Spanish ear, and
is always permissible, if more than two vowels are involved. This is
Espronceda's justification in the following:
Si se murió, a lo hecho, pecho (8)
Necesito ahora dinero (8)
Su pecho ahogado (5)
(2) The vowels of three words may not combine if the middle word is y,
e, he, o, or u. Examples:
¡Pues no ha hecho mal disparate! (8)
Que conduce a esta mansión (8)
But: Cuando en sueño | y en silencio (8)
Si tal vez suena | o está (8)
Alma fiera | e insolente (8)
There is one case in the text where _he_ as middle word does enter into
synalepha, but this is merely the fusion of three identical vowels: