Pre-existing condition or not, he is testifying that his oxygen level drops. The mask is not free-flowing. Have you seen these news reporters talk? The mask moves in and out, sucking to their face. You can barely hear them. Why would one person's oxygen drop and another not? Logical thinking.
Because of COPD? You do know what COPD is, right?
Chronic obstructive pulmonary disease (
COPD) is a chronic inflammatory lung disease that causes obstructed airflow from the lungs. Symptoms include breathing difficulty, cough, mucus (sputum) production and wheezing.
Mask or no mask depending on the severity, those that have this condition can have difficulty breathing. Logical thinking