India vs New Zealand 1st Test: Why Wriddhiman Saha has been substituted by KS Bharat on Day 3?

Saha, playing in his first Test since the pink-ball Test against Australia in Adelaide last year, batted in the first innings on Friday, making just one off 12 balls before nicking an outswinger behind to keeper Tom Blundell, becoming one of the five scalps of pacer Tim Southee. He had kept wickets for 55 overs on day two.