Because Ice and Wildfire both lost their loved ones in a forest fire they are able to empathize with each others pain. Sometimes, when they need to, the two of them leave the Cold Winds Herd for a while to mourn the ones they lost.
Wildfire (c) TheXLuckyXOne
Ice (c) me
Lineart (c) Lineartforfree on dA
Background (c) Brother bear 2