That may happen with a hose 
, I remember now a thread of someone with plants with similar damages because the spouse watered them 
and I suggested to use a more precise instrument like I do:
I am aware of the loupe effect from the lights 
of a drop in the leaves and use to swipe them if any 
, that also wouldn’t explain the external circular line pattern 
JoeCrowe pointed out.
If thew stay paralyzed in time then some sort of splash may have occurred, if they grow or get bigger then bugs would be behind, to be continued, thanks for your thoughts … 