Turquoise Pool didn't mention the Witch's mind reading, instead, she deliberately behaved rudely.
'...Finally understand why they say being with a king is like being with a tiger, the heart of an emperor is unpredictable.'
'What do you say?'
'Hmm—' Li Changzhou took out a gold coin of Li Qianxia, tossed it into the air and caught it in his palm, 'Heads or tails? If you guess right, let the useless old Dao go first if there's danger.'
A coin, tossed by his own hand, deciding which side shows based on his preference.
A coin, tossed in front of Turquoise Pool, is it heads or tails, could she not see clearly?
The key is, he let her guess heads or tails first.
From Li Changzhou's perspective, he trusts Turquoise Pool, believes in her experience in managing subordinates.
He added the condition 'let the useless old Dao go first if there's danger', anyway, if danger arises, someone has to go first, why not the useless old Dao?
In Turquoise Pool's view, it is favoritism.