wouldn't be surprised if some of the larger holders were playing with the sp late afternoon, dumping into 4.2c and 4.1c, setting off stop losses, then picking up some on the cheap at 3.8/3.9c.
also critical support is at 3.8c, followed by 3.6c, therefore not broken - expect a bounce back to 4.2c tomorrow (fib level), once indicators start flattening out and turning back up.