If you Hidden Blade your own unit then recall it, do you draw 2 and channel 1?
To answer your question directly: No, Hidden Blade does not channel a rune.
According to the text of the card, Hidden Blade only has two instructions: "Kill a unit at a battlefield" and "Its controller draws 2." It does not contain an instruction to channel a rune.
Regarding your interaction (Hidden Blading your own unit and recalling it):
- If you recall your unit before Hidden Blade resolves: Per RiftJudge FAQ #2058 and #3700, when Hidden Blade resolves, it looks for its target at a battlefield. If the unit is no longer at a battlefield (because you recalled it), the target is invalid. As a result, Hidden Blade cannot determine "its controller," and the draw effect will not happen.
- If you use a death-prevention ability (like Zhonya's/Hourglass) during resolution: Per RiftJudge FAQ #10456, if the unit remains on the battlefield as a result of a replacement effect during resolution, it is still considered a valid target, and the controller will draw 2 cards.
In neither scenario does Hidden Blade trigger a "channel" effect, as that is not part of the card's text. If you have another card in mind that you believe causes you to channel, please provide its name so I can help verify that interaction!