Henry's 20 open play assists might be a LIE

I might be stupid, please help me understand. I was watching Henry's 20 Assist season cause unc did it before I was even born. Assist 10 at time stamp 3:59 and assist 12 at 4:21were both corners that were taken by Henry and scored by team mates off of the initial cross how is this not set piece ( how is this counted as open play)

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