I have question to anyone who really experienced this kind of waveformimages (2).jpg

Obviously, this Is just a snapshot of one video of John Bedini presenting radiant oscillator tube, but I have experienced it on pretty much all my setups. I'm talking about that part where transistor turns on and collector voltage goes way negative. Does this present domě negative current or heaviside flow before actual current flow? This happens at certain ranges of base currents-trigger setups, but also depends on impedance of output battery oř anything connected to the output for that matter, input also has effect on this.

Any meaningful thoughts?
Cheers