Jon groaned and almost dropped to a knee when Mordu slammed into him gritting his teeth as the portals closed - that slam was much harder than he anticipated. So the little bastard wanted to play tag, did he? The Seraphim took a deep breath and stilled his energies creating a field just over his body like an aura, closing his eyes and turning the golden aura into a detector - if anything touched it he'd be able to react before he took another hit. "Damn, that actually hurt…"
Being linked with Raven made the detector aura more potent as he felt the immense dark void that was her power around the light. Jon could traverse portals freely, he just couldn't open or close them - answering the call in the first place he'd kind of piggybacked Fate's trail and gone down the astral rabbit hole before the way was closed off completely.
They had to find Mordu's physical body if they were going to stop this so using the synchronization from Kent he lent his magical senses and indeed his very soul sight to Rachel. Seinken had dramatically different senses from most other species and could literally see all forms of energy in a flowing spectrum making them excellent hunters, trackers and spellcasters - Archons having even more heightened senses to enable them to perform the myriad duties expected of them.
Even in human form, Jon could not see, hear, taste, smell, feel or sense like a human and he had no idea whatsoever how a Terran experienced these things but when he lent his senses to the half demon the glow left his eyes and a tear streamed down one side of his face as he saw for the first time as one would see through mortal eyes. "Is...this how others see the world around them? It is...so empty, cold...and gray."