The specs don't say anything about this behavior.

“A tight little craft,” was Austin’s invariable comment on the matron;[…]. ¶ Near her wandered her husband, orientally bland, invariably affable, and from time to time squinting sideways, as usual, in the ever-renewed expectation that he might catch a glimpse of his stiff, retroussé moustache.

When you feel ready, slowly exhale, allowing the air to move comfortably from your abdominal region up through the top of your head.

Stinging Rebuke Administered to Bald Attempt to Grab City; Goo-Goo Clique Swept Off Their Feet by Landslide Against Municipal Freak