Have you ever flown a DHC8-100 ?
Do you understand what STOL means ?
Which part of "There is no SOP for this failure" do you not understand.
Clue :- Takeoff run at MGW = 2625 feet
Runway lenth = 12000 feet
Therefore they were less than 1/4 of the way down the runway when they aborted.
Landing straight ahead was a no-brainer, they had room to do this and still have half of the runway to spare.