cpl. burt hazeltine , 36 , with st charles parish , was shot three times in face , elbow and eye .
man in his 50s opened fire on deputy as he was directing school buses in new orleans suburb of paradis .
hazeltine , married father of four , is in stable but guarded condition ; he is at risk of losing his injured eye .
paul devillier , 56 , was arrested after a tussle with police ; officials believe he has mental issues .
sheriff champagne says devillier became upset with hazeltine after deputy refused to stop traffic to let him make a turn .
suspect , a former tsa agent , called sheriff 's office and pretended to by ncis agent before the shooting .