A Skink Built to Disappear Into the Ground
Blue tongue skinks are heavy-bodied, short-legged lizards that spend much of their lives half-buried, nosing through leaf litter and soil. Threatened, a skink does not run far; it flattens, huffs, opens its mouth to flash that startling blue tongue, and above all tries to get under something. Fireworks reach it as vibration through the enclosure base and as flashes it has no context for, and its whole strategy for both is to be underground before they peak.
That means your job happens in the afternoon, at substrate level. Once the display starts, the most useful thing you own is a closed, latched enclosure and the discipline not to open it to excavate a skink that has chosen its own shelter.
Deepen the Substrate So Burrows Hold
Check the digging depth across the enclosure well before dark. A skink needs substrate it can fully submerge in, several centimetres deep end to end, not a thin scattering over the floor with one shallow corner. Top it up if levels have compacted, and lightly dampen the lower layer so the skink's tunnels keep their shape instead of collapsing as it pushes through them during the night.
Leave flat pieces of bark or cork lying on the surface as ready-made roofs. Many skinks prefer wedging under a solid cover to open digging, and a skink settled beneath bark with substrate heaped at the edges is about as insulated from tremor and light as this species gets. Feed the main meal in the earlier part of the day, so the evening finds it digesting underground rather than waiting at the glass for food that normally arrives at dusk.
Latch the Lid and Darken the Room
A startled skink is surprisingly strong for its build and can shove against a loose screen or sliding door while scrambling. Weight or latch the top, test the doors, and make sure there is no gap where furniture meets the glass that a determined, flattened lizard could work at. Draw the room's curtains, and if the enclosure sits near a window wall, a towel over that end of the glass takes the edge off the flashes.
Keep other pets out of the room for the night. A cat pawing at the glass or a dog barking at the window adds close-range disturbance that worries a skink far more than distant bangs, and a skink that keeps being flushed from cover to cover all evening finishes the night genuinely stressed.
Read the Morning, Not the Night
Resist checking by digging. If the skink stays buried until morning, that is success, not a problem to investigate. When it emerges, look for normal service: tongue-flicking exploration, a bask, interest in food, and its usual unhurried waddle. A skink that stays buried for a day after a big scare, in an animal that normally surfaces daily, bears watching for another day before you worry.
Raise it with a reptile vet if you find it repeatedly gaping and huffing at nothing, off its food well beyond a couple of days, or with a swollen jaw or limbs, since those point to illness or injury rather than fireworks. Otherwise, restore the ordinary routine and resist compensating with treats and handling. In KinsLe, Care Teams lets you hand the afternoon deepening and latching to one helper and the next-morning emergence check to another for your skink, each marked complete with a timestamp.