What he's saying is that Rav Elazar called Rav Bruna by the name of "bar Bei
Rav"... "young yeshiva student of Rav". This is certainly an improvement
over saying that a young yeshiva student told Rav Bruna: "take me to
where Shmuel is staying so I can see for myself".
In reviewing your answer page for daf 74a, it seems that the kollel also learned this as "Rav Elazar who is a young student of the yeshiva of Rav". Did you send this correction out in the Daf Yomi Forum? If not, may I suggest that you do so...as it seems that this error was commonly made.
That way of reading the Gemara certainly answers your question. The Gemara in Kesuvos 74a uses the phrase Bar Bei Rav in a similar vein, although not immediately following the name of a person. It is not clear which reading is more correct.
Be well!