The patient was examined, what is the minimum necessary care you administer?
After major trauma the bleeding occurs. Every alternate solutions in addition to blood derivatives cause coagulation disorders - thin the blood, hence the coagulation factors (coagulopathy is presented). Crystalloids have the least impact, colloid is indicated in certain cases - a large blood loss and the need to maintain circulation, but only after administration of crystalloid.
Well done, patient was ensured correctly according ABCDE approach.
Steady infusion is not sufficient, since you presume bleeding into the abdominal cavity from traumatic spleen. You can not be fooled by current circulatory stability.