This is a variation of the Fix #2. Instead of a straight jump with the fast spark passing on the top, sometimes the timing is right to jump the oncoming single blue spark followed by an immediate front jump in order to smash the fast spark while it is still passing on the bottom.
At this time, Chambers_N Gaming has 147,031 views for Donkey Kong Jr. spread across 42 videos. There's over 1 day worth of watchable video for Donkey Kong Jr. published on his channel, roughly 9.40% of the content that Chambers_N Gaming has uploaded to YouTube.