Axel panicked when his father-in-law called. Axel wasn't ready to explain Anna's true condition, but Axel couldn't lie.
"Whatever it is, you still have to pick up Robert's phone, Axel. Robert will be even more anxious if the call isn't answered." James advised Axel and Axel nodded in agreement.
Axel went slightly away from where Anna was lying, to pick up the phone from Roberto. But he himself was still confused about what to answer. But if he doesn't pick up the phone, he's afraid of raising suspicion. So before the phone died, Axel answered the phone first.
"Hello, Dad?" said Axel trying to be as calm as possible so as not to arouse suspicion.
"Hello, Axel, is that you?" asked Roberto on the other side. Robert was a little surprised why Anna's phone was with Axel, and Axel picked up the phone.
It's not impossible that it happened, because they were married. But Robert felt they had some privacy.
"Yeah, Dad, it's me, Axel."
