If you look up the definition of imminent then Henry can actually be justified in his usage of the term. He didn't use immediate, which many often confuse with imminent (probably because of its psychological relationship to a word that often follows it - danger).
So deeming it about to happen, coming or on the way is probably correct in his calculations. However, I am just parsing the language here.
im·mi·nent
'im?n?nt/Submit
adjective
1.
about to happen.
"they were in imminent danger of being swept away"
synonyms: impending, close (at hand), near, (fast) approaching, coming, forthcoming, on the way, in the offing, in the pipeline, on the horizon, in the air, just around the corner, coming down the pike, expected, anticipated, brewing, looming, threatening, menacing; informalin the cards
im·me·di·ate
i'mede?t/Submit
adjective
1.
occurring or done at once; instant.
"the authorities took no immediate action"
synonyms: instant, instantaneous, swift, prompt, fast, speedy, rapid, brisk, quick, expeditious; More
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