His silence

Liam kept looking at his sister with sad eyes, he knew that he would be troubled even by letting her stay in the hospital.

And she was also upset, because she didn't want to spend her final days alone just to be treated and given some painkillers..she escaped before so that she would get outside of that place and now there was nothing he could do in that sense to encounter to go there.

She just kept looking at him with tears in her eyes then said :" Brother, if you are willing to make me go to that place then I will just make you responsible for my escape " 

He couldn't just even look at her so he got outside the apartment as if he was running from something inevitable. 

He knew when he brought her back to life that she was going to die as a result of that , he bought some time with his sister to have his goodbyes, he knew what was happening yet when he felt that the end was so close he was so tired.