internal void RemovePair(CollidablePairHandler pair, ref int index)
{
if (pairs.Count > index)
{
pairs.FastRemoveAt(index);
if (pairs.Count > index)
{
var endPair = pairs.Elements[index];
if (endPair.CollidableA == this)
endPair.listIndexA = index;
else
endPair.listIndexB = index;
}
}
index = -1;
}