Did it fall or was it pushed?

Did it fall or was it pushed?

Observation - Did it fall or was it pushed?. Description: Our usual walk through our local wood was blocked yesterday by this large fallen dead tree. Leaning across it was another smaller one. Both trees were heavily covered with ivy, as are many of the trees in this wood. Does the tree die and then act as host

Our usual walk through our local wood was blocked yesterday by this large fallen dead tree. Leaning across it was another smaller one. Both trees were heavily covered with ivy, as are many of the trees in this wood. Does the tree die and then act as host for the ivy to climb up or does the ivy kill the tree?