No problem! As said before, the use of emotions for magical abilities is really just a system in place for players to readily adapt magical powers into Empatheias. For some canons, a specific type of of course is needed, so to make things easier, players can just replace that source with emotions. For the most part, it can be just a 1-to-1 switch without any additional modifications.
Being able to sense others using emotions is definitely doable, though. As to how it would affect him, I'd imagine it would be mostly when the powers used by others also affects the emotional flow. Like the Puella Magica characters, for instance, would have a more direct effect than say someone from Final Fantasy. While Kamille would be able to sense that an FF character is using their abilities generally, he would be more affected and feel a more "emotional burst" or charge when a Puella Magica girl is removing the taint from her soul gem.
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Being able to sense others using emotions is definitely doable, though. As to how it would affect him, I'd imagine it would be mostly when the powers used by others also affects the emotional flow. Like the Puella Magica characters, for instance, would have a more direct effect than say someone from Final Fantasy. While Kamille would be able to sense that an FF character is using their abilities generally, he would be more affected and feel a more "emotional burst" or charge when a Puella Magica girl is removing the taint from her soul gem.
I hope that helps!