Think they reached a new low yesterday. Not content with fielding a known chucker who is being sent to Australia for remedial work on his action, they then allowed him to Mankad the star England batsman just as he was about to tee off. Almost certainly decided the game given how close it was in the end, an extra 20-30 from Buttler would have made the difference.
The Mankad rule is there to prevent batsmen stealing runs, they knew Buttler wasn't doing that and decided that win at all costs was more important.
Test series should be spicey now, the skipper can expect a hard time through it.