19M hit in the RLE with a baseball bat. His physical exam is…

19M hit in the RLE with a baseball bat. His physical exam is as follows: Neuro: GCS 15 Pulm: grossly CTA Cardiac: regular rate and rhythm Gi: soft non-tender + BS Extremities: +2 pulses L DP/PT. Absent pulse R DP/PT. Doppler pulse R popliteal. Cold R foot.  Ian the nurse immediately contacts the provider with a concern for: