Protip: don't sperg out over unexplained things. Research.
I haven't seen anyone weld thankfully. That's why I still have my eyes.
So that was a transformer judging by the closeup pics… now what was this?
https://www.space.com/41393-fireball-explodes-over-greenland-military-base.html
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That's Ashtar Sheran of the Solar Star Command aka. Ashtar Command. Vrillon is the member who narrated this (vid related).
Everything can be explained, but not everything weird is from Earth.