Dr. Delator realized that Sam Potts had used
the innocent clergyman to confirm a tale of
kidnapping that never occurred as he reported it.
Potts had obviously stuck the balloon high
in the oak
as a prop
. On a day without a wind,
could never rise
high into a tree.
a prop: as a support
(como respaldo, soporte)
blown up: inflated, filled with air
breath: air exhaled in respiration
(aliento, aire de la boca)