I would be cautious at jumping to conclusions. Was the TBM issued a landing clearance? Was the Dash cleared to line up? Was the TBM instructed to Go around? Why didnt the TBM go around regardless seeing the Dash on the runway?
Why clear the Dash to line up with another aircraft on short finals?
Maybe Dash was ready immediate but then wasnt or problems on departure clearance which delayed an immediate?
Was the Dash cleared to line up after the landing and was a bit too quick on the after bit which appeared as if the TBM had flown over the top?
Why block the aircraft from departing? Usually only done if money owed or a serious fault on the aircraft with a determined to go pilot?
The pilot would be at fault but that would not stop another pilot flying the TBM out?
Seems odd all round would be interesting to know more.
Pace