he was leaving circle of fire to give hints to BD. yes, he was hiding he's Prithvi. but dat he decided the very moment when hariya told him 'BD sahi kehte the, Prithviraj apni talwar nahin utha pa raha'.
And let me add one thing, when it comes to "ranbhumi" there are rules frm centuries.. which ppl follow, arey yaar even on indo-pak border there are rules to war.
in 'ranbhumi' no one can fight in nght, dat was rule in 'mahabharata' also.
like prithvi, noramlly senapati's leading forces, dat was true rajputism. not like BD or Vanraj.
in new promos also it is shown vanraj suggesting one ;yojana' to BD , i hope dat goes in rgt way , otherwise i already thinking dat Vanraj shud b killed in war against prithvi