The last accident was surely collective lack of awareness on both their parts for running like crazy people on a road with vehicles, TBH either Sai or Virat could have been hit by a vehicle at that juncture. They were both being very careless on the road. But it was very spontaneous and one could say happened in the spur of the moment without much forethought for road safety.
This time's accident was simply unfortunate, she went to save a kid and fell into the pit. Nobody is to blame for this except say general misfortune of something so dangerous happening while a person went selflessly to save a kid with good intentions.
TBH, all the crap they have been mouthing about Sai and Virat going apart being dangerous for either of their lives is so annoying. Totally irrelevant, nobody say Sai fans or Virat fans or Sairat fans are enjoying these out of context dialogues with no relevance or consequences to the seriousness of the situation. They have been showing regressive content for over a month now, some positive message or redemption from either of the characters would have been likeable over these stupid dialogues.
I would give Devi Tai the leeway here out of all the characters, she has the mind of a child. Children keep fluctuating per their moods with tantrums or opinions. It is the adult's with logical thinking in the context that should explain or calm her down. She was not wrong at the instigation points about a night before, she blamed herself as well. They should have never brought her to the hospital, these people write anything for plot convenience.