Stupid question Spanning tree

Stupid question about Spanning tree per vlan: Couple of Nexus7k ( first is root bridge for vlan 10 and the other is secondary root Bridge)

In vPC there is connect a couple of Nexus5k

Each N5k has a single link to a switch in access on vlan 10

So loop could occur cause vlan 10 is between the N5k and down to the other switch.

Where vlan 10 will be block by spt? I think one down to the switch