《元史·列传·卷四十六》
使者临行时良弼将一份密奏交给他，并叮嘱道： 开始逮捕二帅，只是要把他俩囚禁起来，听候朝廷处置。臣认为，把事情张扬出去多有不便，宜尽快处决为好。擅杀之罪在我而不在宣抚司。若皇上责怪希宪等，望使者把这份密奏呈上。 
良弼具密状授使者，言： 始遣捕二帅时，止令囚以俟报，臣窃以为张惶不便，宜急诛之，擅杀在臣，实不在宣抚司，若上怒希宪等，愿使者即出此奏。 
When the envoy was leaving, Liang Bi gave him a secret report, and instructed him: "When you start arresting the two marshals, just keep them captive and await further instructions from the Court. I think it is not appropriate to make a big fuss, and it would be better to execute them as soon as possible. The blame for this private execution lies with me and not with the Xuanfu Office. If the Emperor should blame Xi Xian and others, I hope the envoy will submit this secret report."