The Streamer Lightning seems to be based on splitting ball lightning (micro string knots) the same as in the amateur lab.

For real streamers, see also;: Guus Pemen, https://twitter.com/i/status/1401602301962428421

Below: Energetic (Free vacuum Energy) but evaporating ( creating single strings:  monopole radiation) of artificial Ball Lightning Nuclei ( String Knots)  made by high voltage / silicon discharge.

Splitting electric charged Ball Lightning into smaller ones in nature by falling through a tree (India).