How do people in multiplayer cast haste on their own without combining magic?

>>1 edit: Some of the spell damage calculation on this page is wrong. On single player, damage calculation of fira, thundara, and bilzzara is actually 90 in the center of the vortex and 30 on the edges. The edges can swirl and hit for a total 2 times, so it can either be 30 or 30×2. So fira, thundara, and *blizzara* can actually be more powerful than firaga, thundaga, and blizzaga. The caveat being that firaga, thundaga, and blizzaga have wider AoE and are a consistent 60 damage throughout.

Some of the spell damage calculation on this page is wrong. On single player, damage calculation of fira, thundara, and bilzzara is actually 90 in the center of the vortex and 30 on the edges. The edges can swirl and hit for a total 2 times, so it can either be 30 or 30×2. So fira, thundara, and blizzard can actually be more powerful than firaga, thundaga, and blizzaga. The caveat being that firaga, thundaga, and blizzaga have wider AoE and are a consistent 60 damage throughout.