In The Whispers Season 1 Episode 5, Claire gets to talk to Sean. She brings pictures and tells the story of how they met. Sadly, it doesn't work.
Wes found something weird in Sean's polygraph. The line reading, aka his answers, looks exactly like the fulgurite. Wes theorizes that it is what's underneath the fulgurite that is important. He goes back to Africa to see what's under the crash site.
Sean tells Claire all about his tattoos, and where they lead him. Then there's the one that he hasn't solved - AS 33. Claire takes this news to Jessup, and they think that refers to Arsenic, and if you dose a nuclear weapon in arsenic, you get a salted bomb.
While Claire is cleaning the house, she picks up Henry's baseball uniform, and something clicks. On the shoulder, there is the team name and the player's number underneath. She runs to the baseball program and learns her theory is correct. There's a team called the A's with a player with the number 33.
Turns out that player is named Ethan. Drill asked him to build a volcano with a battery at the bottom of it that makes it go off. Guess who Ethan's mom is? Someone who works with Wes. Drill sure knows how to pick them.
When Wes and his team demolish the fulgurite, they find more of it (or something that looks just like it) underneath.