That's another reason why the death strikes so hard; the warm feeling of togetherness that peaks in the tournament is totally shattered when Krillin is killed. He was Goku's closest friend and symbolized everything about how tight the original cast had become. Tambourine essentially took all of that away with that kick. The group even totally splintered after that, with Goku and Tien splitting off on their own, Roshi and Chiaotzu being killed, and the rest of the gang doing nothing of relevance.
That is why Krillin's first death is really the only one that ever affected me on any kind of emotional level. It broke up the cast.
But then again it is also why the reunion for the 23rd TB is so effective as well

