Hannah was the safety inspector at a Particle Accelerator in Utah. After an accident caused the death of her colleagues she was blamed but any time she was approached or threatened her antagonists were rebuffed by invisible forces. She feared she was being haunted or punished until SHIELD helped her.
An engineer at the particle accelerator, he would create minor faults in order to spend time with Hannah. As a result of one of these a major accident occurred which, possibly due to the Convergence, caused Tobias to be trapped between two worlds. He briefly hung on to existence, attempting to protect Hannah. When he realised she’d been cleared he finally let go.