This is too easy (slight gore warning)

'I guess I could easily topple them right now,' I thought, raising my eyes at the body of the only enemy standing in the area. 

I knew that there had to be others hidden somewhere. Yet, my mana sense couldn't pick the darnest thing. 

In theory, it was possible for someone to render this sense of mine useless... But as I watched the extremely slow pace at which the body of my enemy moved...

I couldn't help but doubt it. 

My mana sense wasn't tuned or even aimed at perceiving other beings, be it beasts, monsters, or humans. No, this quasi-ability of mine was far simpler. 

Realistically speaking, all my mana sense allowed me was to sense the ongoing flow of the natural mana around me. That's it. Nothing more. 

But at the same time, nothing less. 

'I can feel this guy moving,' I thought, easily producing a simulation of what was going on in my mind.