As a player if you slip, mistake yes, mispass mistake, go to ground get skinned mistake, or goalie comes for a ball drops it mistake but taking a drink with back to goal while the balls 20 odd yard away ?.
No that’s not a mistake , that a stupid schoolboy blunder and totally avoidable. Your taught “not to” and set your self positional awareness as a keeper at schoolboy level so at 30 years of age “I will learn from that” no I dont accept that that just highlighted the level of keeper he is.
He should have learned all this when you were at schoolboy level. He was been a clever smart arse and it backfired but worse he picked it up not knowing who kicked it so he fooked up not once but twice.