I don't know of this is intended, but I've seen it happen multiple times where I'll use my bot and if it sees the spike on the ground it'll activate as if it's seen an enemy

Sentinels, in theory, are agents that specialize in holding space for long periods of time, mostly defensively. Sage can wall off areas of the map and deny the enemy space with slows. Cypher and Killjoy have traps and intelligence gathering...