He must have mistakenly called her, that was the thought that crossed Gabriel's mind. However, he had his phone in his hand and did not press a button which could only mean one thing, she was the one calling.
Before his brain could even react, his finger had already pressed the accept button and he brought the phone to his ear, saying, "Hello?"
Then he began to reason, this was unlike Zoe to call him during working hours. Just to be sure, he pulled the phone back enough to read the time, and just as he thought, she should be in class by now. Although Zoe doesn't turn off her phone during class, she puts it on silent so she doesn't get distracted during class in case of a call.
For her to call him could only mean that something was wrong…. Or something happened. His heart began to race and he said into the phone, "Zoe, speak to me…." The silence was beginning to unnerve him, "Did something happen?"
