By stumps the West Indies top-order had built on that dominant bowling effort in reaching 201-2, a lead already of 158 runs with eight wickets in hand.
Opening batsman Kraigg Brathwaite played his usual sheet-anchor role to perfection in compiling an unbeaten 88 from almost five hours at the crease.
He put on 113 for the first wicket with Devon Smith (58), while Kieran Powell stroked his way to 48 in an 81-run stand before falling just before the close of play.
Their serene progress through two sessions contrasted sharply with Bangladesh's woeful batting performance.
Apart from being their lowest Test innings total and lowest for any team in Test cricket in the Caribbean, it was also the second shortest first innings of a Test match — 18.4 overs — in the game's 141-year history, bettering by just one delivery Australia's dismissal for 60 off 18.3 overs by England at Nottingham in 2015.
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