When Stuart Broad bowled the keeper was standing near the stumps and that says a lot about their energy levels and may be so is the reason the fast bowlers were not used.
Out of the total of 86 overs that India batted, Broad/Stone bowled just 16. On the other hand, the spinners bowled the remaining 70 overs. I agree that the fast bowlers can't be used for long spells under such hostile conditions. But Joe Root could have given 10-12 overs each to the two pacers. If he had done that, then most probably they could have got the lead under 350-400. Now the match has slipped out of England's hand.
Just now England lost two quick wickets - that of Rory Burns and the night-watchman Jack Leach. They still need 430 runs, with just 7 wickets in hand. I won't be surprised if the Indian spinners wrap up the match before tea tomorrow. After such a great performance during the first test match, England was disappointing during the second match.
The day ended up where England lost 3 wickets for 53 and still trail by 429 runs. So tomo the match should be over the series will be level by 1-1. Ashwin is having the best time with bat and bowl and will be the player of the match unless England produce some miracle in batting and happens to win the test match from here. England performance might be other way around if they would have won the toss and bat first. Might be India would be under pressure in such situation just like now how England is in pressure of losing it.