Yeah, suicide is not where I'm leaning on this one. Actually, suicide sounds a bit ridiculous for this case, doesn't it?
I'm trying to visualize two people with duct-taped feet, connected at the waist to each other, and, don't mean to be disrespectful, but it seems more like a comedy skit than a suicide pact. Why would they do that to commit suicide? It would be really difficult to get over the railing of a bridge without moving their feet.