踏火行：脚下生烟，追我的先尝尝

fires[#fires + 1] = { x = P.x, t = 2.6 }

 fx-firetrail

local FireTrail = {}
local TRAIL_TIME, LIFE, BURN = 2, 2.6, 1

local fires = {}

function FireTrail.Run()
    SL:SpeedUp("player", 1.2)
    SL:RegTick("trail_lay", function(dt)
        if not SL:IsMoving("player") then return end
        fires[#fires + 1] = { x = SL:GetValue("x", "player"), t = LIFE }
    end)
    SL:RegOnce("trail_over", TRAIL_TIME, function()
        SL:EndTick("trail_lay")
        SL:SpeedUp("player", 1)
    end)
end

local function onFireTick(dt)
    for i = #fires, 1, -1 do
        local f = fires[i]
        f.t = f.t - dt
        for _, u in ipairs(SL:GetUnitsNear(f.x, 26)) do
            SL:ApplyBurn(u, BURN)
        end
        if f.t <= 0 then table.remove(fires, i) end
    end
end

SL:RegTick("fire_tick", onFireTick)
SL:RegClick("run", FireTrail.Run)

return FireTrail