Of course, this is all early info & will change by the minute. As the guy in the video linked below indicates, it appears that the tail-mounted engine may have flamed out (see white smoke) also possibly due to ingestion of junk flying off left engine/wing. Numbers are Vref numbers are worthless on one engine. Vref numbers are worthless with one engine detached from the airplane. V numbers are established and tested with the airplane intact.

Also, as he points out, the "roll" may have been enhanced by the outboard leading edge flaps being still deployed, with the left wing slats may be retracted due to the hydraulic system interconnects. But again, merely speculation for discussion at this point. However, one of his main points was "at this point, the crew was doomed....". The flight was over.

https://talk.newagtalk.com/forums/thread-view.asp?tid=1219349&mid=11425185#M11425185#mce_temp_url#