The 22-year-old Sharma, who took two five-wicket and one 10-wicket haul in the series so far, observed that the West Indies batsmen struggled against bouncers at the Windsor Park here.
"If you look at this track, it`s not easy to play bouncers. It`s a slow track and we need to be patient, the less they make the better for us," said Sharma, who has had a roaring success in the series with 22 wickets so far at an average of 15.13 and economy rate of 2.95.
West Indies are presently leading India by 81 runs but have only four wickets left going into the final day with the second new ball being just three overs old.
To stress on his point, Ishant pointed out that the West Indian hero of the day, Kirk Edwards, found it difficult to play bouncers properly.
"He was top edging bouncers and a few such shots fell in vacant areas. Kirk played well but he could have been out a few times," he said.
"I still feel we bowled very well and didn`t allow them to score at a rate not more than 2-odd per over."
Sharma, who has so far sent down 112 overs in the series, or more than 40 overs per Test, finds the conditions at Windsor Park none too suited for fast bowlers.
"It`s too slow and very hot. But then that is an uncontrollable thing and I need to believe in myself," he said.
Sharma had suffered a mid-career slump missing the World Cup and a few other series but the young pacer worked hard on his fitness and is extremely hungry to make up for the lost time.
"Not only this but every series is important. As for me, there are reasons to self-motivate myself -- why was I dropped; why I couldn`t play the World Cup; the (early omission) ODI series (in the Caribbean)," said Ishant, who took his 100th Test wicket in the second Test in Barbados.
The beanpole fast bowler also issued a warning to England for the forthcoming series considering "the form we are in and the strengthening of fast bowling resources with the return of Zaheer Khan."