Anyone who saw A New Hope in 1977 recall R2d2 sabotaging R5-D4?

We are rewatching A New Hope with my daughter again and my wife and I both have a memory of R2d2 shooting something out at R5-D4 just before he blew.

This is never mentioned in the list of changes.

Does anyone else who was A New Hope in 1977 when it was just "Start Wars" recall something shooting out of R2 that caused R5-D4 to pop?