Hello 
Sorry my Spanish isn’t that good anymore so I used a translator. Lol but as dishsoap was saying:
&CHARACTER2 starts reaction_animation_here
CHARACTER1 (animation)
Dialogue.
Example:
&TAMI starts laugh_giggle
ELAINA (talk_unsure)
Espero que mi traductor haya funcionado correctamente …
Tami will laugh as Elaina speaks. Just make sure to use & instead of @ and place the character’s reaction before the other character speaks.
Partly translated on my translator: Tami se reirá mientras Elaina habla. Solo asegúrate de usar & en lugar de @ y coloca la reacción antes de que hable el personaje.