The vision of T. rex is the most advanced out of possibly anything with eyes, positioning as great as an owl’s, with vision details up to 20x better than a human’s vision, & seeing up to 6 kilometers in front of it, it could definitely see you regardless of if you’re moving or not. it also has impeccable senses of smell & hearing. however, considering how big it is compared to you, it probably wouldn’t eat you, so it’s just curious, & will probably eventually lose interest in you