No, I'm saying that certain funds and institutional investors in Japan saw the risk of a rout on US treasures and decided to sell before this happened. That set off an even greater rout because of the usual cascade effect in financial instruments.I'm going to assume you're not saying someone's selling tresuries in anticipation of stock market rout...
So are you suggesting it was actually China's theoretical sale that prompted Japan to sell which in turn forced Trump to capitulate? That China just looked at its treasury holding and that was enough for Trump to fold?
Lastly yeah I don't think Trump cares about Congress right now.
Trump blinked because a rout in US treasures, at a time when tons of people in positions of power within the US were already complaining about his tariffs, was too much. It fit his personality and political tactics to claim quick victories when he's pressured so that he can appear like he's still "winning," since his psychology does not allow him to ever "lose." In doing so, however, he's put the US in a worse negotiating position, because now the US's partners know that its tolerance for pain is low.