As Derby loved a robust spell as soon as play resumed after the break, Johnson Osong reduce inside on his proper foot and introduced a save from Myles with a low effort.
The hosts took benefit of being on high and regained their lead within the 67th minute as defender Banks met a nook with a agency header to make it 2-1.
Myles was alert on two separate events to thwart Rams ahead Justin Oguntolu, first with a glancing header after which in a one-on-one scenario, earlier than Derby struck the woodwork by way of Adisa Osayande.
Because the motion swung from finish to finish within the East Midlands rain, Victor Musa hit the crossbar for the Reds from a Harry Amass set-piece and Amass later fired the ball over from shut vary from a Thwaites cross.
However within the 92nd minute, substitute Thwaites curled a surprising left-footed strike into the nook previous Derby keeper Harley Worth to salvage some extent for a battling younger United facet.
MATCH DETAILS
United: Myles; Kamason, Munro, Kingdon, Amass; Devaney, McAllister (c) (Armer 75); Musa, Baumann (Thwaites 71), Scanlon; Biancheri.
Subs not used: Trialist, Byrne-Hughes, Abdoulaye.
Objectives: Allen 3, Banks 67 | Kingdon 25, Thwaites 90+2.
Booked: Devaney.
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