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"How did he do that?! Can his power teleport object across space and time?! That's a power that only Mother can use!"
Agonitias was shocked to learn what Blake had done, even as he sent back the sword towards him to deal some damage or buy him some more time.
However, Blake didn't exactly moved things through space or something similar to teleportation, no, the answer was simpler than that!
Umbral Crismon Shadows are all contained within a pseudo-dimension; therefore, everything is connected. Any part of it, any "cloud" is part of this pseudo-dimension.
Meaning that when Blake placed the weapons inside the clouds he left behind, he was also able to instantly bring them out through new masses of Umbral Crimson shadows he summoned later.
"Oh, the sword? It's mine now, though."