I play ping pong. I can't imagine that that hit was even a subconcussive impact. The paddle is light. You were at the end of your stroke so the speed was slowing.

You obviously have no clue what 'second impact' means relating to concussions. You must first have a serious concussion with serious symptoms before you can be at risk of second impact syndrome.

Just curious. Where did you get your first concussion information that has you so anxious about any head contacts?