Footwashing

I'm in the process of an essay on John 13:5-15.  It's the footwashing passage in John - only recorded in John, the book the doesn't include the institution of the Lord's supper.  I'm enjoying immensely although my brain is getting fried!  It's a greek exegesis essay so I'm needing to wrestle with questions around the specifics of the text - what does this word mean, what is the emphasis and should it actual be there at all anyway.  

But some of the questions I've been pondering are why we celebrate communion but we don't have footwashing as a ritual.  I think I've got some answers around that question.  

Another question raised by many scholars is whether there is a reference to baptism in the passage - I don't think there is.

However, one of the things that's hit me deeply has been Jesus' reaction to Simon Peter - in this passage and at other times (we looked at John 21 last week at church).  Jesus' firmness and his grace has hit me again - in his reaction to Simon Peter and to me.