Woman walking dogs hears possible vocalizations and knocks in Marymoor Park witnessed in King County, Washington

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I was walking my dogs in Marymoor Park, near Redmond, WA. It was in the early-to mid-afternoon. The park was predominantly empty and quiet, and despite recent rain, the paths were not overly muddy. It was a sort of hazy day, with some sun, probably 50-60 degrees. We had followed a somewhat under-utilized trail/road that parallels Hwy 520, going from the velodrome down to the Sammamish River. It is a grassy area with occasional brush. The trail makes a T-junction at the Sammamish River bank. One can turn right and go under Hwy 520 to Redmond Town Center shopping district, or turn left and remain in Marymoor Park. Just at the bank of the Sammamish River, there is a stand of brambles that create large mounds on both sides of the trail on the Marymoor side of Hwy 520. This little bramble forest is probably about 30 yards long. The Sammamish River travels along the west edge of the park, emptying into Lake Sammamish about 1/4 mile away (or slightly more?), in the park. (Salmon run this ...