Dear friend, welcome to HCM!
He probably had shot his BP and developed focal neurological deficit.
Is he normal now?
Is he alert and talking normal?
If he has lowered sensorium, headache, vomitting, nero deficits like power loss, you should consider a very high BP
or brain bleed and go to the ER immediately. keep his BP well controlled.
Consult your doctor soon.
Take care and please keep me informed of your progress.
I hope to have answered your query satisfactorily.