Player killed someone, therefore the timer started.
After 10 seconds, the player kills other 4 players.
The timer has ended, while the player had only 5 kills.
A few seconds later, the player kills two more people.
Because the first timer has already ended, the 4 kills won't be counted.
Even though the 4 kills + 2 kills would be for example in 10 seconds, the plugin won't catch this event.
It's not that easy to describe the event, so I hope you understood what I just wrote. This is also mainly the reason I started the thread.