The Overwatch 2 animated short showed off many abilities not found in the original game. Many players speculate that these abilities might be added in Overwatch 2, but some don't want to wait that long. Fans have taken to the workshop to recreate the interlocking shield and then posted it on Reddit.
The video shows a Brigitte and Reinhardt holding up their shields. When the two shields reach each other they combine into one larger shield. Unfortunately, this ability isn't ready to be in regular games. There are many questions about how strong the shield will be and which hero takes the shield damage. Balancing this would also be complicated since a healer would become more of a shield.
Workshop modes that build on existing Overwatch abilities are becoming more and more popular. One recent example is a Moira passive ability that allows her to heal more by sacrificing her own health and a Winston ledge grab to increase the ease of movement.