Three wickets in the last 17 overs on Thursday gave West Indies bowling coach Curtly Ambrose some hope his side can end England's innings quickly on Friday.
England were cruising late on the third day of the second Test in Grenada, 30 runs ahead of West Indies and just three wickets down.
But when Marlon Samuels bowled Gary Ballance (77) in the 108th over, taking the tourists to 329-4, England started to stumble, with Moeen Ali run out for a duck two overs later.
Devendra Bishoo then dismissed Ben Stokes (8) in the 119th over, as England reached stumps at 373-6, and Ambrose was thrilled with his team's persistence after a tough day in the field.
"It was very encouraging, knowing nothing much had been happening, to have knicked a couple of wickets towards the end," he said at a media conference.
"It is very encouraging and hopefully we can get those remaining five [sic] wickets pretty early tomorrow."
With England 74 runs ahead, the key to any potential victory for the home side will be wrapping up the visitors' tail early on Friday at the National Cricket Stadium in St George's.
"They've [the West Indies bowlers] got to dig deep. It's all about will power, first of all, because their skills are never in question, and of course, you've got to be patient," Ambrose said.
"It's not the type of pitch where you can blast people out. You got to be patient and work to get batsmen out.
"So that's one of the things I've been telling them all along, 'even if you're not getting wickets, give nothing away. Sooner or later when we get a couple of wickets, the scoreboard will look a bit different'."