Back in the old times some monsters reacted different on the sources of damage. Giant Spiders for example weren’t immune to fire and therefore blockable by firebombs.
Trapping them was still very difficult because you couldn’t target them in the attack list. You had to run away, click on the rune, calculate the moving speed of the GS and then click somewhere on the screen trusting that the serverlag would not kill you meanwhile.
Some people could do this perfectly and even managed to trap many GS on the same screen. That’s where this picture was taken.
© by Lightbringer
Today I can only say: Don’t try this at home. You will surely see the sign: “You are dead”.
But even back then it was very difficult to shoot the Firebombs exactly at the right time to the right place.