The very tender spot - that probably is a trigger point. Have him press on it till it fades away. The rub the area, drink lots of fluids. You may have more than the one TrP.
*you need to get rid of the TrPs before you can really treat the spasms.

Spasms are when the whole muscle is hard and "locked up"
TrPs are the small very sore spots inside the muscle.

TrP info -
http://neurotalk.psychcentral.com/thread125577.html