I guess you need to add some variable that resets on every new round. The very 'First Blood' in that round will have the variable change to 1(for example). And the next first blood would not be counted thereafter.
PHP Code:
new firstblood = 0
public firstblood(parameters) {
if (firstblooddone != 1) {
firstblooddone = 1;
// Do the firstblood sound etc etc
}
}
Only reset firstblooddone back to 0 on every round change then!
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