Some of the Angevins who mocked you are blinded, others lose ears, noses or hands: it is a mewling pack of miserable wretches that you set on the road to Anjou.
When you return to the siege of Domfront in short order, you make certain that the garrison learns of your treatment of the Angevins at Alençon: then you offer them one last chance to surrender immediately. It is only minutes before you see the gates thrown open.
Now you can afford to make a demonstration of how you show deserved mercy: you allow these Angevins to return to Anjou, with their lives and bodies intact.
So swift was your action, that count Geoffrey is completely taken aback. His plans and strategy are ruined: you have regained your two lost towns, and have no reason to meet his army in battle. With your presence on your southwest border, his troops cannot disperse to raid and pillage your peasants. He certainly cannot take any of your strongholds. He withdraws back into his lands
What will you do next?
Proceed with the marriage that Baldwin of Flanders (in spite of his daughter's wounded pride) is all in favor of.
Gather your forces and invade king Henry's realm: he deserves it, for not supporting you against Anjou.
Send king Henry your defiance: telling him that you disallow his suzerainty over you, because he has not upheld you against your enemies.
Gather your forces and attack Anjou: they certainly deserve it, after all that count Geoffrey has done to Normandy.