Well said, everyone;
Having practiced for only 3 years now, I try to always remember that I always will be a beginner, no matter who I practice with. My less experienced partner has placed a great deal of trust in my abilities to teach, as I have placed in him/her to teach me (and if you let them, they can teach you a hell of a lot!). And when a senior student (read Sensei or sempei) is practicing with me, I try and learn, but if asked, will try and impart my impressions (always followed with "Or I could be wrong").
Just remember; when asked, just repeat exactly what you were told, and show exactly what you were shown.