SpoilerThe trip over has distorted your senses, not to mention the fact that you are not fully accustomed to 'modern' environments; both of which mean you find it difficult to sense any danger.
SpoilerNulls are what psykers fear most. But, Tyson doesn't know about those just yet. They're Forbidden Lore (Something)SpoilerForbidden Lore (Psykers) would probably be the best bet