Though Tyson is also afraid of alcohol and thunder/lightening, his strongest - and oldest - fear is his pyrophobia. However, it is also the one he finds easiest to deal with.
He doesn’t have a specific nervous tick or one particular method that will keep him calm around it. Instead, fire always puts Tyson on edge - even a simple candle flame - but beyond refusing to allow the flame out of his sight for more than a few seconds, Tyson will be fine; no matter how long he has to stay in the fire’s presence.
When a mission requires surviving in the wilderness, Tyson can create bonfires and fire pits, but he’ll sleep almost too far away to feel its warmth and - frequently - let his food get burnt, hesitating too long to retrieve something from the spit. Generally, he favours making a Dakota Fire Pit, as removing the flames from sight makes things easier for him and it’s also a better way of staying undetected.
Unlike his phobia of thunder, lightning, and alcohol, which can all be linked to specific events or memories, Tyson doesn’t know what - if anything - caused his phobia of fire. It had been that way ever since he was a young child, some of his earlier memories are being afraid of the Shabbat candles lit by Ms Appleby.
Whilst Jethro would watch the flames in the fireplace and be transfixed by how they moved, and want to burn various items to see how it would look, Tyson would stare at the flame to make sure they weren’t touching anything flammable. As if looking away from the flames would mean that the house would suddenly turn to ash as the fire burned it down.
With all that said, Tyson understands why fire appeals to people aesthetically; and he absolutely understands being attracted to things you knew were dangerous.