Unicore |
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I'd let a character try to do something like look for feet imprints, although I'd give the silenced, invisible character a bonus to their Static stealth DC, unless the character is spending actions to do things like grab a sack of flour and throw it into a space, or cause it to start raining in the area.
Ubertron_X |
The question is: Why don't you have any other imprecise or precise sense?
I'd say touch is a rather precise sense but unfortunately it is not mentioned in the CRB, so you will have to house rule for effect. The disadvantage of touch is short range (neither a 30 foot cone nor a 15 foot burst within line of sight) and very limited area so I would twist the rules to align with the seek action when looking for hazards.
Something like: Choose 4 continous hexes within reach, GM attempts a single secret Perception check, etc.
Else I am afraid you are dependend on indirect detection as Unicore already mentioned.