Hubby just reminded me also....to keep in mind that those windows would likely be ballistic bullet proof windows. So they aren't going to react the same as normal windows with internal small detonations (potential). Also...he suggested that det-cord could potentially be wrapped around steel beams and not cause (explosions) but weaken the structure. Okay...so...lots of theories with only a tiny smidgen of any kind of knowledge. lol. Totally have zero idea...but interesting to come up with theories!