What Happens When Roderigo Attacks Cassio?

When Roderigo attacks Cassio he is unsuccessful as Cassio is wearing armor. Cassio retaliates by stabbing Roderigo and killing him. While this fight is occuring Iago stabs Cassio in the leg because that is an area which is exposed.

Why does Roderigo attack Cassio?

Once Cassio leaves, Iago tells Montano that while Cassio is a wonderful soldier, he fears that Cassio may have too much responsibility for someone with such a serious drinking problem. Roderigo enters, and Iago points him in Cassio's direction. ... Montano steps in to prevent the fight and is attacked by Cassio.

What happened to Roderigo after the fight with Cassio?

Roderigo is stabbed by Cassio, and when Iago realizes Roderigo is still alive and could reveal his treachery, he kills Roderigo. Stabs Roderigo and he is wounded by Iago.