Classic chart breakout. Chart shorts are covering and getting long. That doesn't happen in a day or even a week. This kind of covering takes time...the stick gets much much lighter and multipoint moves are common in this kind of circumstance.
There is no overhead now either...no prev positions to be traded thru.
I told you if it broke 386 it would trade 400s...I think 430 is likely...but expect the usual shakes. Buy any weakness I think...the rest of the street will be