Based on your description, you should get out the chainsaw. Trees have significant amounts of water and carbohydrates stored in the twigs, branches, and trunk. So, it's not surprising that the damaged tree shows buds expanding, leafing out, and extending young twigs. That said, once the heat of June arrives and the tree calls for more water than the damaged root system can supply, you would expect to see leaves and young twigs shrivel and dry out.
