What is the difference between an Inghimasi and Intihari: The difference between Suicidal and Submerged fighters in Jihadi kooky world

The Jihadi rhetoric now distinguishes between two kinds of Jihadi fighters: 1) the Intihari is someone who is sent on a suicide mission with a suicide belt.  His mission is purely to detonate.  2) An Inghimasi (or the submerged fighter) is someone who is sent with different light weapons AND a suicide belt.  Ostensibly, the second kind is the best fighter of the bunch and is sent to engage the enemy until he finishes his ammunition and then he will detonate the suicide belt.  This is what we now have to learn in Middle East studies?