May I play the naysayer for a moment Gaetan? I do this to myself, especially on stuff I catch at night, just because there can be so many lookalikes, so don't feel bad. Nighttime tornadoes, especially quick, small ones from a distance can be especially difficult to detect, even for the most experienced chasers.
Looking at the captures you had on the link you provided....sure does appear to be a funnel cloud. The part the makes my mind pause for question is the touching down. Let me explain why.
I note two sets of power poles in the images, one set appears to run along side the road (I am assuming you were on a road) and the other set appears to run out away from the road at possibly a 90 degree angle.
Anyway, in the first image in your series, you can see one of the distant poles just to the right of the closer pole, with the funnel feature just to the right of that.
In the second images, the funnel appears to move closer to the distant power pole, and both the distant power pole AND the funnel appear to move closer to the nearer power pole. This would be consistant with the vehicle moving down the road, with the closer features appearing to move "faster" the features that are farther away.
In the 3rd image in your series, both the funnel and the distant pole have moved to the left of the closer pole, which again, is constant with the vehicle traveling down the road and the nearer pole "moving by" the vehicle to the right.
It's in this image also that the funnel feature and that same distant power pole now appear to line up with one another, since that distant pole also would appear to move to the right faster than the distant funnel feature. This gives the impression of the funnel being complete to the ground.
This optical illusion is enhanced with the final image you posted, the one in this thread, which makes the distant pole to even more appear to be an extention of the funnel feature.
Anyway, that's my own personal diagnosis and opinion on it. Some frame captures after that last one as the car continued to move should be more definitive.
I often analyze stuff like this I get at night to this detail just because in many cases, after dark tornadoes, especially very brief ones can be very hard to distinguish from other features, such as cloud scud tags, closer clouds appearing to hang from clouds farther away. Lightning strobe effect ruines your distance perception at night. This is even further compounded by not having related things such as power flashes.
