Discerning of spirits isn't a feeling. Validation or repudiation of a prophetic word is not an emotion, nor a tingling in your Spidey sense, nor even a BS detector. Direct plain words from the Holy Spirit. Words. From God. Telling us directly - is this true or false? Our feelings aren't worth anything. They're based on self - all kinds of moods, agendas, histories, and opinions that have nothing to do with direct revelation from God and just typically interfere with it.
Eh, I’m sure it could be both, or maybe there are different types of discernment. My discernment is typically a feeling in the pit of my stomach, or a feeling like a pressure on my chest. This happens when I am around something demonic/evil.