This is a unique but not uncommon feature of damage. When the interior pipes and supply lines of the home are compromised, they can guide water to both the inside and outside of the property. It may seem convenient for damage to direct itself to the exterior of the home, but if gone unchecked, this can cause a ripple effect, hence directing the damage inwards. This is an example of that situation but did not lead to interior damage because the owner caught this early on. Make sure to inspect every aspect of your property to avoid any and every strain of damage.