1. testforblock * * * stone_button 12
2. execute @e[name=r1] ~~~ tp ^^^0.4 facing @e[name=t1]
3. effect @e[name=r1] invisibility 1 1 true
4. execute @e[name=r1] ~~~ execute @p[r=2] ~~~ playsound conduit.short @a ~~~ 5 2
5. summon skeleton_horse * *.2 * grow_up r1
6. execute @p ~~~ ride @p start_riding @e[name=r1,r=5] teleport_rider
7. execute @e[name=t1] ~~~ kill @e[name=r1,r=1]