"Now you have brought it up [talking to Lehmann] I'll have a think about it," said Flower.
"I think both sides must concentrate on playing the game of cricket on the pitch. In a competitive way but finding the right balance.
"A balance has got to be found on the pitch between competitiveness and not overstepping the line."
Former England player and respected commentator David Lloyd has said some of the first test sledging he heard over a stump microphone, which didn't go to air, "went too far".
"That [Clarke sledge] situation has been dealt with by the ICC so I don't really need to go into it," said Flower.
"We all have a responsibility - both sides and the leaders involved - to find the right balance and the way we play the game on the field. We're all adults out there."
Flower said he became aware of Trott's condition the first time they met as player and coach in 2009.
Despite the fact Trott had headed home just one test into the five-test series, Flower defended England's decision to pick him.
"He has handled it really well over the years and he has handled it well on the tour so far," Flower said.
"Just as if someone had a hamstring issue leading into the first test it is our job to assess the likelihood of him being able to last the test or that hamstring not hampering his performance."
- AAP