Star Trek Picard: Every Easter Egg & Hidden Reference From 'Et In Arcadia Ego, Part 2'
15. The Game
Auntie Raffi, Rios, and Elnor plan to use Narek's grenades to destroy the synths' beacon, which Narek describes as molecular solvent grenades with short fuses. The TNG episode "Reunion" established that the Romulans exclusively used explosives that rely on molecular decay detonators, so this is likely a similar type of device.
To sneak the bomb past the synths, the group replicates a false soccer ball to house the grenades. Rios was previously seen playing soccer in "The Impossible Box" right before he and Agnes had pity sex.
The synths guarding Coppelius Station, by the way, are carrying purple weapons very similar to the engineering tool Saga gave Raffi, again implying the existence of some kind of super-advanced technology unique to the synths.