Look at what Eliot had in his draft for the lines
Tell the truth now, which is the stronger version of the lines? Which tells a better story? With Eliot's final version of lines 401 and 402 how do you interpret lines 403-409? Using his draft wording does the interpretation change? Why do you suppose Eliot chose the final wording?
401) Datta: what have we given?
402) My friend, blood shaking my heart