I mean saying your whole crew "just kept painting" sounds a little off to me. If a bright thing was really hovering over a jobsite for 20 minutes, somebody would've at least pointed at it or said something, even if they didn't stop working. I've been on crews where guys flip out over a weird cloud or a drone, so 20 minutes of total silence about it seems hard to believe. Maybe it's just me, but I'd bet at least one person joked about it or snapped a pic. Not saying you didn't see something, just that the "nobody reacted at all" part is the part that doesn't add up.