If you then create the portfolio once again by borrowing $S_ t_1 $ at charge $r$ you are able to realise a PnL at $t_2$ of Column 9: Effects of cancellation / Modification – PnL from trades cancelled or improved on The present day Juice journal's editor Joram Vuille wrote; https://www.youtube.com/watch?v=qMmsQ4kKgY4