Found what I was looking for! If someone has pressure applied to the carotid artery, it can cause loss of blood flow to the brain. We obviously don't know if the 'breath restriction' included any pressure on the carotid artery, but either way, if there was a loss of oxygen flowing to Warriena's brain for even a short time, even without losing consciousness, there can be a range of side effects - see below. There were obviously reasons why Warriena was behaving the way she was on the balcony (fear, alcohol-induced) but just thought this may have also contributed. I admit I have to go back and read the articles in detail but just another pondering.
Furthermore, Strack is concerned that persons who have been strangled
can present agitation associated with TBI, which may be misinterpreted
by the responding law enforcement officers as hostile or uncooperative
(Strack, 2000; Strack & McClane, 1999).
http://www.doj.state.or.us/victims/...s_about_possible_neurological_alterations.pdf
Cerebral hypoxia and hypoperfusion — Several elements of strangulationactivity may result in cerebral hypoxia. These include breath holding, externallimitation of chest wall expansion, and compression of the carotid arteries.*Compression of the carotid sinuses further reduces cerebral oxygenation throughreflex bradycardia and vasodilation.*Acute severe hypoxia can cause loss of consciousness in 10 to 20 seconds,permanent brain damage in three minutes, and death in four to five minutes.**Hypoxia that is less severe can cause impaired judgment, drowsiness, dulled painsensation, excitement, disorientation, and headache.** Other symptoms and signsof hypoxia include anorexia, nausea, vomiting, tachycardia, and tachypnea;hypertension occurs when hypoxia is severe.
http://dhss.alaska.gov/ocs/Document...er Strangulation Assaults - Hawley - 2012.pdf
The most common neurological consequences aretransient loss of consciousness and confusion, whichmay be prolonged but are generally self-limiting(Jongewaard et al., 1992; Yeong et al., 1994). Theremay also be agitation, disorientation and restlessness(Haller and Donahoo, 1971; Lee et al., 1991). Neurologicalabnormalities were seen in 12 of 14 (86%)patients with traumatic asphyxia in a 10-year periodin one institution in Wisconsin, USA (Jongewaardet al., 1992).
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.841.9888&rep=rep1&type=pdf