as for the first: it's not a really precise skill and he mostly just kind of feels his way through it, but in the interest of not overdoing it, i'd probably range him at being able to sense things from about a half-mile off? down from the likely several he's capable of in canon. i'll go ahead and limit his ability to tell things apart, too, so instead of being like 'THERE ARE 70 PSYCHOTIC BATS' it'll probably be more like 'THERE'S A LOT OF SOMETHING WE SHOULD PROBABLY MOVE.' basically think of it as a danger barometer rather than a method of devising something useful, like a battle tactic.
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as for the first: it's not a really precise skill and he mostly just kind of feels his way through it, but in the interest of not overdoing it, i'd probably range him at being able to sense things from about a half-mile off? down from the likely several he's capable of in canon. i'll go ahead and limit his ability to tell things apart, too, so instead of being like 'THERE ARE 70 PSYCHOTIC BATS' it'll probably be more like 'THERE'S A LOT OF SOMETHING WE SHOULD PROBABLY MOVE.' basically think of it as a danger barometer rather than a method of devising something useful, like a battle tactic.