Eikthyrnir couldn't believe he was summoned much earlier than expected. Father's plan, the Healing Hand's antagonism towards Askr and Embla, future Ratatoskr's anguish, the planned assassinations... Has not happened. As much as he wishes to tell you about what will happen, his inner self chose to keep this secret to himself in fear he may change the future for the worse.
...A few years went by. The Healing Hands have begun their plans, sent to assassinate the royals of Embla and Askr and perpetuate strife. Eikthyrnir let the events play out. Reuniting with Ratotaskr as an ally brings some comfort at least. However, Eikthyrnir deep down knows you will question him once they realized he was one of the Healing Hands, once the Order of Heroes encounters the Eikthyrnir of their world.
And he was right. During down time, Eikthyrnir was lifting weights. He sees you coming towards you, likely to confront about why he kept his mouth shut. The stagman sets the weights down and turns to face you. His ornate face mask hides his guilt.
"It's... good to see you," Eikthyrnir couldn't look at you in the eyes, "Is there something you've need of me?" He was prepared for you to ask him why he let the assassinations committed by his own organization happen.