Rift Herald + Orb Ward thingy Bug
So basically what happened was the Rift timer was ticking on the last second before Baron spawns. Precisely spamming your Trinket/Rift button while it's the last second of Rift would not only spawn Rift but Give you the Ward/blue orb thingy which then doesn't put it on cooldown instead instantly allows you to place another trinket or use it again.
In shortness, you can summon Rift Herald right when it's about to expire while using the trinket right after and if successful you can instantly have another trinket re-useable instead of going on cooldown.
Edit: Here is the video link