It has been five years since that flashpoint moment, which, to sports followers across the spectrum, signaled the seriousness of the global health crisis that would kill millions and bring society to a halt. Seemingly everybody has a personal, visceral story about where they were and how they spent the ensuing days, weeks, and months defined by uncertainty, isolation, and even fear. “It was a crazy time,” said Sixers big man Guerschon Yabusele, who was playing in the China Basketball Association when the pandemic originated in that country. “And we were all part of this.”