Chasing a modest 190 for win, the Indian willow-wielders found the going tough on a two-paced Antigua pitch to lose the fourth ODI by 11 runs and allow the West Indies to stay alive in the five-match series.
India, however, lead the series 2-1 after the first ODI was abandoned due to rain.
"It (the pitch) kept getting slower and shot-making wasn't really easy. Those have been the nature of wickets we have seen so far. But we didn't really bat to our potential. It was a gettable score. I just felt the batsmen let the team down," said Bangar.
"Credit to them (West Indies). They executed their plans really well but I just felt it was a very very gettable score," he added.
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Chasing the modest target, India lost three wickets, including that of Virat Kohli, inside the 50-run mark before Ajinkya Rahane (60 off 91) and Mahendra Singh Dhoni (54 off 114) steadied the ship with a crawling but crucial 54-run stand for the fourth wicket.
"The plan was for somebody to bat deeper into the innings. That's what Ajinkya did till he got out. Till that time we were on course but suddenly we lost couple of wickets. Those wickets in the middle overs actually pushed us back. The run rate just kept on creeping higher and higher," Bangar said at the post-match press conference.
The batting coach rued the shot-selection of Indian batsmen and said the platform was ideal for the lower middle- order to prove its worth.
"These are big experiences for them. When Hardik, Jaddu (Ravindra Jadeja) got out it was still run-a-ball. In these situations shot selection was really crucial and at times I just felt they erred in that," Bangar said.
Included in the team after the first three ODIs, Jadeja failed to make any impact with both bat and bowl, but Bangar backed the Saurashtra all-rounder.
"But as far as ODI cricket is concerned he really bats down the order and I feel those are certain things that get magnified because it's not that only the lower-order should contribute, it's also about what we did early on in the innings. So, let's not be too harsh on Jadeja.
"Today he ended up conceding under 5 runs an over. He bowled with the wind while the other spinners were bowling against the wind. At times we are not going to churn out performances," Bangar added.
"You need to assess the conditions. At times you need to play according to the demand of the situation. MS (Dhoni) is batting higher up the order.
"The kind of depth we have in our batting order at No. 6,7 and 8 when they can't really come off, he (Dhoni) can't play with the freedom that he should. It all boils down to how the batsmen at the other end are batting, how many wickets we have in hand," the coach said.
Bangar was full of praise for the bowling unit for restricting West Indies below 200.
Bangar also supported the under-fire Yuvraj Singh, who has been below-par with the bat for quite some time.
"Yuvraj has been making some match-wining contributions at No. 4. Unfortunately he couldn't play today because of a hamstring strain. But all in all we have lot of options for No. 4 position," he concluded.