A lot of the time, Izzy was the one 'in the chair' so to speak. Tai and Matt took a deal of the danger they faced head on while he ran tactical and support. When it was necessary, he was front and center, of course. It was always a matter of circumstance which Izzy acted accordingly to in the moment as much as was possible.
When it came to his and Tai's relationship, Izzy often had to press back against his ability to be stubborn. If anyone was more so, it was Izzy, they simply each had their own quality to their stubbornness which dictated how it was used in the moment.
It was a lucky thing Izzy was already working at getting their door open - he was just pushing the door open enough to slip in and see when Tai literally jumped out of the window. They were not on the ground floor.
"Now, Tentomon!" In an all too familiar flash of Digivolution, Izzy scrambled to his feet and out the window after Kabuterimon as he dove to catch Tai and Augomon before they hit the ground below. Letting out a sigh, Izzy literally face palmed before reaching out to smack Tai on the back of the head.
"What were you thinking? Do you really think I came here without figuring out what was going on and planning accordingly?" He huffed, folding his arms over his chest as he looked down at Tai, who may or may not have ended up partially sprawled over Izzy's lap.
Tai wasn't the only one on a shot of adrenaline with his heart thumping against his rib cage. His face was tinted in red, hand coming up to run through his own hair in exasperation as Kabuterimon took them back up to the window. "Are you alright?"