Why does dally call Darry for help?

Dally calls Darry for help because he knows that Darry is responsible and can provide the assistance needed in a crisis. Dally is in a tough situation after Johnny's injury, and he feels overwhelmed and desperate. By reaching out to Darry, he seeks support from someone he trusts to handle the seriousness of the situation. This highlights Dally's vulnerability and his recognition of the importance of family and friendship in times of need.