Dawn had a small bottle of poison in her hand that she was ready to throw it to Blake's face the moment he was getting close to her.
She needed him to get as close as possible with her, because she only had one chance and she couldn't screw it up.
However, Ava jumped between her and Blake in order to save Dawn from her evil son, but Blake had enough and finally saw his mother as nothing, but a nuisance.
He saw his mother in the eyes when he slit her throat and her blood splashed his face. There was nothing in his eyes, there was no sadness, remorse, or even guilt. He looked… indifferent.
"I told you not to interfere and live your life quietly, but you didn't listen…" Blake said coldly, he watched Ava's body fell to the floor and stepped on her, as he continued to walk toward Dawn.