No one's injured, really, it's just cramps because of the extreme amount of humidity out there. I followed the game all day today and players from both teams have been suffering. Mortaza went out with an ankle tweak earlier in the day and came back, as well. If you look at the Bangla bowling line-up you will see 3 bowlers with incomplete overs, because they had to go off/were filling in after someone went off.
We have to drive home the advantage tomorrow. As LS was suggesting during commentary, India might not enforce the follow-on in the event that it is available, because it might be too strenuous for the bowlers to bowl 3-odd days in a row. I'm looking at Dravid scoring a ton and then both batsmen accelerating--with Karthik coming back and getting his ton.