A 2-minute cartoon for Episode 3. The host writes the whole path into one SRv6 uSID address (fcbb:bb00:100:3:fe00::). Spine1 punches off its own 100 and the rest shifts left. Leaf3 sees 3:fe00 and unwraps (End.DX4). Spray across both spines: 510/490. When link 2 fails, host probes miss 3 times and the host reroutes in about 70 ms (measured 66-77 ms), compared with 6-9 s for eBGP in ep2. The switches don't route. The host does.