Context is key. While this video shows Tekken prevailing over Street Fighter in a series of challenges at Comic-Con 2011, what you don't see is what led up to it.
Earlier, at the Street Fighter X Tekken panel on Thursday, Yoshinori Ono, producer of the Street Fighter series, played a video in which Tekken counterpart Katsuhiro Harada demanded to appear in the game as a playable fighter. Ono politely refused. The two agreed to settle their differences in a series of thirteen challenges. Among the feats of strength, in my notes, I have bat races, wood-block striking, milk-chugging, and a weird competition where both did chair-poses against a wall with a plank spiked with nails placed underneath their crotches. At the end of the video, Ono-san prevailed.
That begat the whipping Harada receives at the beginning of this video, from six people cosplaying as Street Fighter's Poison, revealed last week as a combatant in SFxT. Three of those cosplayers were dudes, I might add, one of which was Ono, which explains why he is wearing a white tank top while he battles Harada on the fight sticks during the panel (seenb in the video).
Afterward, both sides agreed to take it outside to a nearby park, where fans representing both Namco and Capcom battled it out for the pride of each franchise, where Tekken prevailed.