to be fair to alcine, those short pinpoint counters are powerful and have taken out many solid-chinned guys. juanma's 1st kd of ponce was with a very short right hook counter that he never recovered from, abe's 1st kd of miranda was short and he never recovered, donaire koed darchinyan with a short counter, pac finally knocked out iron-chinned diaz with a short punch, and of course alcine tonight. in those fights, the loser's chin was holding up fine or they were physically fresh, but 1 short-armed timely counter took them out.
alcine's chin may be poor, though i dont know if this fight was conclusive. great punch by santos.