Felix could easily feel the energy of those that tried to approach Willie's location. Since they thought that Felix and the guinea pig had injured each other, maybe fatally. They wanted to get a piece of the fat meat that was being dangled in front of them.
They didn't know if it was a trap, but Willie was just too tantalizing for them to give up this opportunity.
Felix's body slowly disappeared as he became unseeable and unsenseable. There was no trace left of him around, and even if Willie was awake right now, he would become scared. Thinking that Felix disappeared from thin air, despite their spiritual bond.
Felix was crouching nearby as he observed the surroundings with his senses and advanced eyesight.
He could feel how his future prey was getting closer and closer to his hunting spot.
They were almost here...
Felix could see their silhouettes on the horizon as they approached his location quickly.