Hal watched Arya pause and physically rearrange her expression and it caused his eyes to narrow.
If he was asked why he acted that way, he would have said he could not explain it. It was as though he instinctively knew the right things to say and they WERE the right things,
Because while it was subtle, Hal could already confirm some things.
'So are you considering going into business with her?' Grimoire said with a hint of mockery as it referred to Hal's dreams of using his Blood to evolve the beasts in Tretch Forest.
Hal ignored the time and answered seriously...
'Of course not, she's obviously cray cray'
...well, sort of.
He was actually exaggerating as there was nothing to suggest Arya was truly mentally unstable.
Speaking of Arya,
Now that she was no longer displaying hostility, she was smiling sweetly,