Nothing Norax did could be called painless or safe, both with Ureyn and with Nollura.
Ureyn could have died if his body hadn't accepted Norax's energy, especially considering how much power he used to heal Ureyn's heart.
Now, something similar was happening to Nollura.
Fortunately for her, she was not injured and did not face the threat of losing a large part of her power as Ureyn had. Even the fact that Norax's palm pierced her chest right through to her heart was not critical, as no organs were damaged.
But Norax wasn't going to stop there. He had no desire to torture or cause Nollura pain for no reason, because he had one.
When Ureyn awoke, his power level would be slightly lower than Nollura's was now, and Norax understood that, as well as the fact that it wasn't enough.