[ConnorMcLeod]

Would be better to declare FL_CHECK as a const, but it doesn't make any significant difference.
Also, flags and speed vars are not needed since they are used only 1 time.
End, consider that some plugins (especially on kz servers) put players into spectator team, so Ham_Killed won't be set and your alive variable will hold wrong value, i think it's better to keep is_user_alive native.

Approved.