The West Indies cricketers are just 39 runs from a Test victory against Pakistan, after reaching 114 for 5 with opener Kraigg Brathwaite still at the crease after a tense fourth day ended early due to bad light.
West Indies are chasing a victory target of 153 in the third Test in Sharjah to break a 14-match losing streak stretching back to last May last year.
Pakistan began the day on 87 for 4 before a battling 91 by opener Azhar Ali and 42 for Safraz Ahmed looked to have steadied the ship.
But they lost their last five wickets for 33 to end on 208 with West Indies' captain Jason Holder claiming his first five-wicket test haul.
Roston Chase claimed the pick of the wickets in laughable circumstances.
Having dived high to catch a Mohammad Amir drive over long-on, he realised he would step over the rope and released the ball back into play.
Chase recovered so quickly that Amir, who had stood still admiring his shot, was unable to scramble home as Chase's accurate throw from the boundary ran him out.
Their total of 208 left the West Indiees chasing a tempting 153 to end the tour on a positive note having lost the first two Tests.
Brathwaite was defiantly standing on 44 with Shane Dowrich on 36.