SOme sweet lines from Ramachartimanas:
As we see Trijata all the time give updates of both sides (Ramji n Ravans) to sitaji... The same way she updated sitaji of the fight going on betn Ramji n Ravan.... SItaji asked her
" why do you not tell me whats going to happen? Why Ravan does not die even when the arrows of Sri Ram have struck off his heads... It is my ill luck that sustains him, the same misfortune which separated me from lord, who made me suffer trouble, prompted me to spk harsh words to Lakshman... with all such words Sitaji was crying and cursing her fate... n getting weak ....
The enemy of the gods will surely die if the arrow pierces his heart.. But the Lord is careful not to strike him there for he knows that you abides in Ravans heart... and in yours heart is Lords
own abode and in Lords belly are contained numberless spheres which will all perish the moment his arrow pierces Ravans heart... This all filled Sitajis mind with both joy n sorrow.
Then trijata spoke again to comfort sitaji
Ravan will get disconcerted when his heads are cut off, with the result that you will escape his mind and in that particular moment Ramji strike him in his heart...