Riddler takes them out to try and calm Ed down.
Away from the house and temptation and messy emotions, Ed does start to settle again, until he's quieted down and able to function again. Riddler's relieved and lets Ed pick the lock on the framing shop, letting himself in and acquiring what he needs and letting himself back out again with no sign of robbery. It's possible it might take them months to realise it ever happened.
Ed, being the sentimental one, is satisfied with this.
Riddler is not.
He spends a while acquiring his present. It's not as valuable as it could be, but he's satisfied. And that's enough for them to go home and get changed into more casual clothes and settle on the bedclothes with a book. He might sleep. He might not. Either way, he could be quiet until morning.
Away from the house and temptation and messy emotions, Ed does start to settle again, until he's quieted down and able to function again. Riddler's relieved and lets Ed pick the lock on the framing shop, letting himself in and acquiring what he needs and letting himself back out again with no sign of robbery. It's possible it might take them months to realise it ever happened.
Ed, being the sentimental one, is satisfied with this.
Riddler is not.
He spends a while acquiring his present. It's not as valuable as it could be, but he's satisfied. And that's enough for them to go home and get changed into more casual clothes and settle on the bedclothes with a book. He might sleep. He might not. Either way, he could be quiet until morning.