[Ycto]

May I just tell you that you're only showing the gametext for half a second?

Код:

GameTextForPlayer(playerid, const string[], time, style)

Time on yours is "500" (Milliseconds) which means half a second. 1000 is one second.
Try to show it for a longer amount of time (for example: 5 seconds ==> 5000).

Код:

GameTextForPlayer(playerid, "Hitman", 5000, 2);