After all, the Manties still probably don't know that Imbesi was informed of the pending attack on Princess Ruth beforehand - at a time when Erewhon still was formally allied to Manticore. A deal's a deal and all that ...

So what happens when they kiss and make up, and then a treecat or HH discover that oops, Imbesi was happy to let the niece of Elisabeth get shot, raped or abducted ... ?

After all, Victor Cachat was a formal enemy of the SKM at the time, so he can be "pardoned" for not caring about Manticoran royalty, but what Imbesi did to his still - allies was beyond the pale - especialy since Elisabeth was opposed to High Ridges stupid treatment of Erewhon ...